NHTSA ID Number: 10233431
Manufacturer Communication Number: 078314
Summary
Diagnostics for DTC B1500 and U1500
NUMBER: 07-83-14
DATE: 03/12/14
| APPLICABILITY: | All 2014-15MY Forester, Impreza, XV Crosstrek |
|---|---|
2015MY WRX & STI Models | |
| SUBJECT: | Diagnostics for DTC B1500 and U1500 |
INTRODUCTION
This bulletin provides information currently missing from the Service Manual for diagnosing Body Integrated Unit (BIU) DTCs B1500 and U1500 (Keyless UART Communication Malfunction on the push-button start vehicles) as listed above. Diagnostics are included in the current version of the Service Manual for DTC U1500 but only for key-start vehicles. The Service Manuals will be updated to include this information in the near future.
IMPORTANT NOTE: DTC U1500 is only applicable to 2015 WRX & STI Models while B1500 is only applicable to 2014-15MY Forester, Impreza, XV Crosstrek (including Hybrid model).
(UART= Universal Asynchronous Receiver Transmitter)
SERVICE PROCEDURE / INFORMATION
- Information and diagnostic steps contained in the RED boxes are applicable to DTC U1500.
| STEP | CHECK | YES | NO |
|---|---|---|---|
| 1 CHECK DTC.
<Model without push-button ignition switch> 1) Insert the ignition key to the ignition key cylinder and remove. 2) Read the DTC of body integrated unit using Subaru Select Monitor. <Model with push-button ignition switch> 1) Carry the access key in the vehicle and push the start button twice without depressing the brake pedal to turn the ignition switch to ON. 2) Read the DTC of body integrated unit using Subaru Select Monitor. | Is B1500 current malfunction?
Is U1500 current malfunction?
| Go to step 2. | Go to step 7. |
| STEP | CHECK | YES | NO |
|---|---|---|---|
| 2 CHECK DTC.
<Model without push-button ignition switch> 1) Turn the ignition switch to OFF. 2) Disconnect the body integrated unit and keyless entry control module connector. 3) Connect the disconnected connectors. 4) Insert the ignition key to the ignition key cylinder and remove. 5) Read the DTC of body integrated unitusing Subaru Select Monitor.
<Model with push-button ignition switch> 1) Turn the ignition switch to OFF. 2) Disconnect the body integrated unit and keyless entry control module connector. 3) Connect the disconnected connectors. 4) Carry the access key in the vehicle and push the start button twice without depressing the brake pedal to turn the ignition switch to ON. 5) Read the DTC of body integrated unit using Subaru Select Monitor. |
Is B1500 current malfunction? Is U1500 current malfunction? | Go to step 3. | Go to step 7. |
| 3 CHECK HARNESS.
1) Turn the ignition switch to OFF. 2) Disconnect the body integrated unit and keyless entry control module connector. 3) Using the tester, measure the resistance between terminals. Connector & terminal With TPMS (i171) No. 11 — (R221) No. 11: Without TPMS (i171) No. 11 — (R80) No. 3: | Is the resistance 10 Ω or less? | Go to step 4. | Repair the open circuit of harness or replace harness. |
| STEP | CHECK | YES | NO |
|---|---|---|---|
| 4 CHECK HARNESS.
<Model without push-button ignition switch> 1) Turn the ignition switch to OFF. 2) Use a tester to measure the voltage between the terminals. Connector & terminal With TPMS (R221) No. 6 (+) — Chassis ground (–): Without TPMS (R80) No. 4 (+) — Chassis ground (–): | Is the voltage 10 V or more? | Go to step 5. | Repair the power supply circuit. |
| <Model with push-button ignition switch>
1) Carry the access key in the vehicle and push the start button twice without depressing the brake pedal to turn the ignition switch to ON. 2) Turn the ignition switch to ON. 3) Use a tester to measure the voltage between the terminals. Connector & terminal With TPMS (R221) No. 4 (+) — Chassis ground (–): | |||
| 5 CHECK HARNESS.
Using the tester, measure the resistance between terminals. Connector & terminal With TPMS (R221) No. 5 — Chassis ground: Without TPMS (R80) No. 7 — Chassis ground: | Is the resistance 10 Ω or less? | Go to step 6. | Repair the ground circuit. |
| 6 CHECK CONTROL MODULE.
1) Turn the ignition switch to OFF. 2) Remove the keyless entry control module. 3) Install a keyless entry control module that was operating normally on another vehicle. | Does it operate with the remote control key of another vehicle? | Replace the keyless entry control module.
<Ref. to SL-78, REMOVAL, Control Module.> | Replace the body integrated unit. |
| 7 CHECK CONNECTOR.
Check the connector used for keyless communication for poor contact. | Is there poor contact of connector? | Repair the connector that has poor contact, or replace harness. | It is possible that temporary poor communication occurs. Delete the DTC. |
8 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| SUBARU | FORESTER | 2014-2015 |
| SUBARU | IMPREZA | 2014-2015 |
| SUBARU | WRX | 2015 |
| SUBARU | WRX STI | 2015 |
| SUBARU | XV CROSSTREK | 2014-2015 |
1 Associated Document
Manufacturer Communications
NUMBER: 07-83-14
DATE: 03/12/14
NHTSA ID Number: 10067877
Manufacturer Communication Number: 07-83-14
Summary
DIAGNOSTICS FOR DTC B1500 AND U1500
1 Associated Document
Service Bulletin Document
NUMBER: 07-83-14
DATE: 03/12/14
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