NHTSA ID Number: 10209927
Manufacturer Communication Number: 18-217-22R
Summary
This bulletin announces Service Manual corrections for the diagnostic trouble tree for DTC B1788.
INTRODUCTION:
This Service Information Bulletin announces Service Manual corrections for the diagnostic trouble tree for DTC B1788. These corrections will be made to the Service Manual at a later date. If DTC B1788 is detected in the applicable models listed above, follow the new diagnostic information outlined below.
SERVICE PROCEDURE / INFORMATION:
IMPORTANT NOTES:
- Customer satisfaction and retention starts with performing quality repairs.
- Refer to the applicable Service Manual and review: General Description > Repair Contents > Action required before & after Battery Disconnect. Additionally, record any stored seat position(s) before proceeding. Relearn any seat position memory after work is complete. If the power rear gate (PRG) height has been customized, that position must also be noted and relearned.
- Required diagnostic tool information/description is listed on page #2.
Required Diagnostic Tools:
NOTE: BF Test Harness (98299AN000), BB Test Harness (98299FL020) and BC Test Harness (98299FL030) are all essential tools.
Section 1: DTC CHECK
1. Perform a visual inspection of the associated wiring harness and seat area to verify there is no obvious physical damage, foreign objects / obstructions, or aftermarket modifications. If any such conditions are found, submit a completed QMR with detailed photos of the findings.
2. Switch the ignition to ON.
3. Read the DTCs of the airbag control module using the Subaru Select Monitor.
Are any of the following DTCs displayed as a current malfunction? (DTC B178D, B178E, B178F, B1790, B1791, B1792, B1793, or B1794)
YES
Perform the diagnosis for the displayed DTCs.
NO
Proceed to Section 2.
Section 2: CHECKING HARNESS & ODS (SHORT TO GROUND)
IMPORTANT REMINDER: Whenever reconnecting the ground cable terminal to the battery sensor, torque to 7.5Nm (5.5ft.-lbs. or 66inch-lbs.) while supporting the sensor with the other hand as outlined in the applicable Service Manual under: STARTING/CHARGING SYSTSEMS > Battery Sensor.
NOTE: Steps 1 through 7 are to be performed to prevent any unintentional airbag module inflation caused by residual electrical current.
Legacy & Outback Only
1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor.
2. Disconnect the connector (AB93) from the RH front seat belt pretensioner.
3. Disconnect the connector (AB97) from the RH adaptive force limiter.
4. Disconnect the connector (AB99) from the RH rear seat belt
5. Disconnect the connector (AB89) from the RH seat cushion airbag module.
6. Disconnect the connector (AB87) from the side airbag module RH.
7. Disconnect the connector (AB91) from the RH curtain airbag module.
8. Disconnect the connectors (AB41, AB42, & AB43)from the airbag control module.
9. Connect the connector (1BF) of the test harness BF to connectors (AB41, AB42, &AB43).
BRZ Only
1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor.
2. Disconnect the connector (AB93) from the Front RH seatbelt pretensioner.
3. Disconnect the connector (AB97) from the Front RH adaptive force limiter.
4. Disconnect the connector (AB87) from the Front side airbag module RH.
5. Disconnect the connector (AB91) from the Front RH curtain airbag module
Perform the following measurements with an ohmmeter at connector (4BF) of the BF test harness.
Connector and Terminal Information:
- (Connector 4BF of Test Harness) Terminal No. 10 – Chassis Ground
- (Connector 4BF of Test Harness) Terminal No. 10 – (Connector 4BF of Test Harness) Terminal No. 15.
CAUTION:
- Connect the positive terminal of the ohmmeter to IGN side (No.10).
- Connect negative terminal of the ohmmeter to GND side (Chassis ground or No.15).
- IMPORTANT: If these test connections are reversed, an incorrect value will be displayed.
Is the resistance 1MΩ or more?
YES
Proceed to Section 4.
NO
Proceed to Section 3.
Section 3: CHECK THE SEAT HARNESS & ODS FOR SHORT TO GROUND
1. Disconnect the connector (AB7) from the rear airbag harness.
2. Connect the connector (1BB) of the BB test harness to connector (AB7).
Perform the following measurements with an ohmmeter at connector (2BB) of the BB test harness.
Connector and Terminal Information:
- (Connector 2BB of Test Harness) Terminal No. 5 – Chassis Ground.
- (Connector 2BB of Test Harness) Terminal No. 5 – (Connector 2 of the BB Test Harness) Terminal No. 4.
CAUTION:
- Connect positive terminal of the ohmmeter to IGN side ( No.5 ).
- Connect negative terminal of the ohmmeter to GND side ( Chassis ground or No.4 ).
- IMPORTANT: If these test connections are reversed, an incorrect value will be displayed.
Is the resistance 1MΩ or more?
YES
Replace the rear airbag harness along with the body harness.
NO
Proceed to Section 8.
Section 4: CHECK THE HARNESS FOR OPEN CIRCUIT
1. Disconnect connectors (AB67, AB68, AB69, & AB70) from the load sensors.
Using an ohmmeter, measure the resistance between connector (4BF) of the BF test harness and the load sensor connectors (AB67, AB68, AB69, and AB70).
IMPORTANT CAUTION: DO NOT connect the ohmmeter directly to the load sensors. In order to prevent any terminal damage, the BC test harness must be connected directly to load sensor connectors (AB67, AB68, AB69, and AB70).
Connector and Terminal Information:
- (Connector 4BF of Test Harness) Terminal No. 10 – (AB67) Terminal No. 1
- (Connector 4BF of Test Harness) Terminal No. 10 – (AB68) Terminal No. 1
- (Connector 4BF of Test Harness) Terminal No. 10 – (AB69) Terminal No. 1
- (Connector 4BF of Test Harness) Terminal No. 10 – (AB70) Terminal No. 1.
Is the resistance less than 10Ω?
YES
Proceed to Section 6.
NO
Proceed to Section 5.
Section 5: CHECK THE SEAT HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector (AB7) from the rear airbag harness.
2. Connect the connector (1BB) of the BB test harness to connector (AB7).
Using an ohmmeter, measure the resistance between the connector (2BB) of the BB test harness and the load sensor connectors.
IMPORTANT CAUTION: DO NOT connect the ohmmeter directly to the load sensors. In order to prevent any terminal damage, the BC test harness must be connected directly to load sensor connectors (AB67, AB68, AB69, and AB70).
Connector and Terminal Information:
- (Connector 2BB of Test Harness) Terminal No. 5 – (AB67) Terminal No. 1
- (Connector 2BB of Test Harness) Terminal No. 5 – (AB68) Terminal No. 1
- (Connector 2BB of Test Harness) Terminal No. 5 – (AB69) Terminal No. 1
- (Connector 2BB of Test Harness) Terminal No. 5 – (AB70) Terminal No. 1.
Is the resistance less than 10Ω?
YES
Replace the rear airbag harness along with the body harness.
NO
Proceed to Section 8.
Section 6: CHECK THE REAR HARNESS FOR SHORT TO POSITIVE
1. CAREFULLY re-connect the ground terminal to the battery sensor and turn the ignition switch to the “ON” position.
Using a voltmeter, measure the voltage between the connector (4BF) of the BF test harness and chassis ground.
Connector and Terminal Information:
- (Connector 4BF of Test Harness) Terminal No. 10 – Chassis Ground.
Is the voltage less than 1V?
YES
Replace the airbag control module.
NO
Proceed to Section 7.
Section 7: CHECK THE SEAT HARNESS FOR SHORT TO POSITIVE
1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor.
2. Disconnect the connector (AB7) from the rear airbag harness.
3. Connect the connector (1BB) of the BB test harness to the (AB7) connector.
4. Connect the ground terminal the battery sensor, turn the ignition to the “ON” position.
Using a voltmeter, measure the voltage between the connector (2BB) of the BB test harness and chassis ground.
Connector and Terminal Information:
- (Connector 2BB of Test Harness) Terminal No. 5 – Chassis Ground.
Is the voltage less than 1V?
YES
Replace the rear airbag harness along with the body harness.
NO
Proceed to Section 5.
Section 8: CHECK THE CONNECTOR
1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, disconnect the ground terminal from the battery sensor.
2. Inspect the airbag control module connectors and load sensor connectors for loose pin drag and/or poor terminal contact of any kind. Replace any section that has been found to be a fault source.
3. Disconnect all the test harness connections and revert vehicle harness connections to the original status.
4. CAREFULLY re-install the ground terminal to the battery sensor and turn the ignition switch to the “ON” position.
5. Read the DTCs of the airbag control module using the Subaru Select Monitor.
Is the DTC B1788 currently stored?
YES
Replace the seat cushion frame assembly.
NO
Finish the diagnosis.
7 Affected Products
Vehicles
1 Associated Document
Manufacturer Communications
NUMBER: 18-217-22R
DATE: 01/14/22
REVISED: 03/09/22
MC-10209927-0001.pdf 1206.322KB
NHTSA ID Number: 10207189
Manufacturer Communication Number: 18-217-22
Summary
This bulletin announces Service Manual corrections for the diagnostic trouble tree for DTC B1788.
1 Associated Document
Manufacturer Communications
NUMBER: 18-217-22
DATE: 01/14/22
MC-10207189-0001.pdf 1204.554KB
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Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 1 of 7 SERVICE BULLETIN Continued… CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition. Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 is the international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. NUMBER: 18-217-22R DATE: 01/14/22 REVISED: 03/09/22 APPLICABILITY: 2020-22MY Outback & Legacy 2022MY BRZ SUBJECT: Service Manual Correction / DTC B1788 Occupant Detection Sensor Power Supply INTRODUCTION: This Service Information Bulletin announces Service Manual corrections for the diagnostic trouble tree for DTC B1788. These corrections will be made to the Service Manual at a later date. If DTC B1788 is detected in the applicable models listed above, follow the new diagnostic information outlined below. SERVICE PROCEDURE / INFORMATION: IMPORTANT NOTES: • Customer satisfaction and retention starts with performing quality repairs. • Refer to the applicable Service Manual and review: General Description > Repair Contents > Action required before & after Battery Disconnect. Additionally, record any stored seat position(s) before proceeding. Relearn any seat position memory after work is complete. If the power rear gate (PRG) height has been customized, that position must also be noted and relearned. • Required diagnostic tool information/description is listed on page #2. ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. ©2022 Subaru of America, Inc. All rights reserved. Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 2 of 7 Continued… Required Diagnostic Tools: NOTE: BF Test Harness (98299AN000), BB Test Harness (98299FL020) and BC Test Harness (98299FL030) are all essential tools. Section 1: DTC CHECK 1. Perform a visual inspection of the associated wiring harness and seat area to verify there is no obvious physical damage, foreign objects / obstructions, or aftermarket modifications. If any such conditions are found, submit a completed QMR with detailed photos of the findings. 2. Switch the ignition to ON. 3. Read the DTCs of the airbag control module using the Subaru Select Monitor. Are any of the following DTCs displayed as a current malfunction? (DTC B178D, B178E, B178F, B1790, B1791, B1792, B1793, or B1794) Perform the diagnosis for the displayed DTCs. Proceed to Section 2. Section 2: CHECKING HARNESS & ODS (SHORT TO GROUND) IMPORTANT REMINDER: Whenever reconnecting the ground cable terminal to the battery sensor, torque to 7.5Nm (5.5ft.-lbs. or 66inch-lbs.) while supporting the sensor with the other hand as outlined in the applicable Service Manual under: STARTING/CHARGING SYSTSEMS > Battery Sensor. NOTE: Steps 1 through 7 are to be performed to prevent any unintentional airbag module inflation caused by residual electrical current. YES NO Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 3 of 7 Continued… Legacy & Outback Only 1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor. 2. Disconnect the connector (AB93) from the RH front seat belt pretensioner. 3. Disconnect the connector (AB97) from the RH adaptive force limiter. 4. Disconnect the connector (AB99) from the RH rear seat belt pretensioner. 5. Disconnect the connector (AB89) from the RH seat cushion airbag module. 6. Disconnect the connector (AB87) from the side airbag module RH. 7. Disconnect the connector (AB91) from the RH curtain airbag module. 8. Disconnect the connectors (AB41, AB42, & AB43)from the airbag control module. 9. Connect the connector (1BF) of the test harness BF to connectors (AB41, AB42, &AB43). BRZ Only 1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor. 2. Disconnect the connector (AB93) from the Front RH seatbelt pretensioner. 3. Disconnect the connector (AB97) from the Front RH adaptive force limiter. 4. Disconnect the connector (AB87) from the Front side airbag module RH. 5. Disconnect the connector (AB91) from the Front RH curtain airbag module Perform the following measurements with an ohmmeter at connector (4BF) of the BF test harness. Connector and Terminal Information: • (Connector 4BF of Test Harness) Terminal No. 10 – Chassis Ground • (Connector 4BF of Test Harness) Terminal No. 10 – (Connector 4BF of Test Harness) Terminal No. 15. CAUTION: • Connect the positive terminal of the ohmmeter to IGN side (No.10). • Connect negative terminal of the ohmmeter to GND side (Chassis ground or No.15). • IMPORTANT: If these test connections are reversed, an incorrect value will be displayed. Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 4 of 7 Continued… Is the resistance 1MΩ or more? Proceed to Section 4. Proceed to Section 3. Section 3: CHECK THE SEAT HARNESS & ODS FOR SHORT TO GROUND 1. Disconnect the connector (AB7) from the rear airbag harness. 2. Connect the connector (1BB) of the BB test harness to connector (AB7). Perform the following measurements with an ohmmeter at connector (2BB) of the BB test harness. Connector and Terminal Information: • (Connector 2BB of Test Harness) Terminal No. 5 – Chassis Ground. • (Connector 2BB of Test Harness) Terminal No. 5 – (Connector 2 of the BB Test Harness) Terminal No. 4. CAUTION: • Connect positive terminal of the ohmmeter to IGN side ( No.5 ). • Connect negative terminal of the ohmmeter to GND side ( Chassis ground or No.4 ). • IMPORTANT: If these test connections are reversed, an incorrect value will be displayed. Is the resistance 1MΩ or more? Replace the rear airbag harness along with the body harness. Proceed to Section 8. Section 4: CHECK THE HARNESS FOR OPEN CIRCUIT 1. Disconnect connectors (AB67, AB68, AB69, & AB70) from the load sensors. Using an ohmmeter, measure the resistance between connector (4BF) of the BF test harness and the load sensor connectors (AB67, AB68, AB69, and AB70). YES NO YES NO Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 5 of 7 Continued… IMPORTANT CAUTION: DO NOT connect the ohmmeter directly to the load sensors. In order to prevent any terminal damage, the BC test harness must be connected directly to load sensor connectors (AB67, AB68, AB69, and AB70). Connector and Terminal Information: • (Connector 4BF of Test Harness) Terminal No. 10 – (AB67) Terminal No. 1 • (Connector 4BF of Test Harness) Terminal No. 10 – (AB68) Terminal No. 1 • (Connector 4BF of Test Harness) Terminal No. 10 – (AB69) Terminal No. 1 • (Connector 4BF of Test Harness) Terminal No. 10 – (AB70) Terminal No. 1. Is the resistance less than 10Ω? Proceed to Section 6. Proceed to Section 5. Section 5: CHECK THE SEAT HARNESS FOR OPEN CIRCUIT 1. Disconnect the connector (AB7) from the rear airbag harness. 2. Connect the connector (1BB) of the BB test harness to connector (AB7). Using an ohmmeter, measure the resistance between the connector (2BB) of the BB test harness and the load sensor connectors. IMPORTANT CAUTION: DO NOT connect the ohmmeter directly to the load sensors. In order to prevent any terminal damage, the BC test harness must be connected directly to load sensor connectors (AB67, AB68, AB69, and AB70). Connector and Terminal Information: • (Connector 2BB of Test Harness) Terminal No. 5 – (AB67) Terminal No. 1 • (Connector 2BB of Test Harness) Terminal No. 5 – (AB68) Terminal No. 1 • (Connector 2BB of Test Harness) Terminal No. 5 – (AB69) Terminal No. 1 • (Connector 2BB of Test Harness) Terminal No. 5 – (AB70) Terminal No. 1. Is the resistance less than 10Ω? Replace the rear airbag harness along with the body harness. Proceed to Section 8. YES NO YES NO Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 6 of 7 Continued… Section 6: CHECK THE REAR HARNESS FOR SHORT TO POSITIVE 1. CAREFULLY re-connect the ground terminal to the battery sensor and turn the ignition switch to the “ON” position. Using a voltmeter, measure the voltage between the connector (4BF) of the BF test harness and chassis ground. Connector and Terminal Information: • (Connector 4BF of Test Harness) Terminal No. 10 – Chassis Ground. Is the voltage less than 1V? Replace the airbag control module. Proceed to Section 7. Section 7: CHECK THE SEAT HARNESS FOR SHORT TO POSITIVE 1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, CAREFULLY disconnect the ground terminal from the battery sensor. 2. Disconnect the connector (AB7) from the rear airbag harness. 3. Connect the connector (1BB) of the BB test harness to the (AB7) connector. 4. Connect the ground terminal the battery sensor, turn the ignition to the “ON” position. Using a voltmeter, measure the voltage between the connector (2BB) of the BB test harness and chassis ground. Connector and Terminal Information: • (Connector 2BB of Test Harness) Terminal No. 5 – Chassis Ground. Is the voltage less than 1V? Replace the rear airbag harness along with the body harness. Proceed to Section 5. YES NO YES NO Bulletin Number: 18-217-22R; Revised: 03/09/22 Page 7 of 7 Section 8: CHECK THE CONNECTOR 1. Turn the ignition switch to the “OFF” position. After 60 seconds or more, disconnect the ground terminal from the battery sensor. 2. Inspect the airbag control module connectors and load sensor connectors for loose pin drag and/or poor terminal contact of any kind. Replace any section that has been found to be a fault source. 3. Disconnect all the test harness connections and revert vehicle harness connections to the original status. 4. CAREFULLY re-install the ground terminal to the battery sensor and turn the ignition switch to the “ON” position. 5. Read the DTCs of the airbag control module using the Subaru Select Monitor. Is the DTC B1788 currently stored? Replace the seat cushion frame assembly. Finish the diagnosis. IMPORTANT REMINDERS: • SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time. • Always check for any open recalls or campaigns anytime a vehicle is in for servicing. • Always refer to STIS for the latest service information before performing any repairs. YES NO
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