Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1502 warning box communication malfunction

Subaru Legacy BN/BS (2015-2019) Service Manual / Combination meter (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1502 warning box communication malfunction

DTC DETECTING CONDITION:

Communication error between combination meter and spot map light

TROUBLE SYMPTOM:

Malfunction of the warning light inside the spot map light

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Combination meter system Combination Meter System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON, and make sure that the combination meter operates properly.	Does it operate properly-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1502 WARNING BOX COMMUNICATION MALFUNCTION	Check the combination meter power supply circuit.
2.CHECK DTC. Read the DTC. Read Diagnostic Trouble Code (DTC)	Is DTC B1502 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1502 WARNING BOX COMMUNICATION MALFUNCTION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1502 WARNING BOX COMMUNICATION MALFUNCTION
3.CHECK COMMUNICATION CIRCUIT (HARNESS) (OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the combination meter connector. 3) Disconnect the warning box connector. 4) Measure the resistance between combination meter connector and warning box connector. Connector & terminal (i10) No. 12 — (R161) No. 3:	Is the resistance less than 10 --	Replace the warning box. Warning Box	Repair the open circuit of harness between combination meter connector and warning box connector.
4.CHECK CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the combination meter connector. 3) Disconnect the warning box connector.	Is there any fault in the connector-	Repair or replace the connector.	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

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