Subaru Gen1 and Gen2 Telematics DTC B2A01- Diagnostic Best Practices

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NHTSA ID Number: 10188196

Manufacturer Communication Number: 15-278-21

Summary

This bulletin provides additional details and helpful hints to follow when diagnosing a Telematics system DTC B2A01.

 


NUMBER: 15-278-21
DATE: 02/25/21

APPLICABILITY: All Models with Gen1 and Gen2 Telematics
SUBJECT: Telematics DTC B2A01- Diagnostic Best Practices

 

INTRODUCTION:

This Service Information Bulletin provides additional details and helpful hints to follow when diagnosing a Telematics system DTC B2A01.

 

SERVICE PROCEDURE / INFORMATION:

REMINDER:  Customer satisfaction and retention starts with performing quality repairs.

DTC B2A01 in the Telematics system indicates a fault has been detected in the primary antenna path.  The trouble tree takes a straightforward approach to testing by taking DVOM measurements to verify the antenna path’s integrity.  When the DTC is current, the trouble tree outlines steps to test for an open antenna path and / or a path possibly shorted to power or ground.  This testing takes place at the antenna connector for the DCM (AN13 in the figure below) and the antenna cable connection closest to the Sharkfin (AN14 in the figure below).  Should testing indicate measurements outside the expected values, the trouble tree instructs to “replace antenna cable.”

Should the Technician get to the point in the trouble tree where DVOM measurements indicate a faulted antenna cable and replacement is necessary, extra steps should be taken to isolate each of the antenna path sections further to ensure the correct cable section is ordered.  Figure 01 below illustrates there are 3 sections of cable making up the antenna path.  The trouble tree for the model in the example has all testing from the connections at the DCM and the Sharkfin.  It is also worth noting, one of the antenna sections is described as a Feeder Cord Assembly with no mention of the antenna.

3 sections of cable making up the antenna path

Figure 01

 

Figure 02 below illustrates the Forester cable section connection points so the Technician can easily see further isolation is possible even though it is not detailed in the trouble tree.  Isolation (or “splithalf technique”) testing using the same method as the trouble tree must take place at each additional connection point to isolate the faulted section.

Forester cable section connection points

Figure 02
(FORESTER)

 

In order to ensure the best repair outcome possible and avoid replacement of unnecessary parts, use the table below to isolate the additional testing points on other models when diagnosing B2A01.

additional testing points

 


1 Affected Product

Vehicle

MAKE MODEL YEAR
SUBARU SUBARU 9999

 


1 Associated Document

Manufacturer Communications

NUMBER: 15-278-21
DATE: 02/25/21

https://www.nhtsa.gov/recalls?nhtsaId=10188196

MC-10188196-0001.pdf 1102.529KB

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