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: 

Combination meter system Ref. to WIRING SYSTEM>COMBINATION METER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POWER SUPPLY CIRCUIT. 

   Turn the ignition switch to ON, and make sure that the combination meter operates properly.

   Is the check result OK?

   Yes  : Go to  2.

   No  : Check the combination meter power supply circuit.

2. CHECK DTC. 

   Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1502 displayed? (Current malfunction)

   Yes  : Go to  3.

   No  : Go to  4.

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. Check the resistance between combination meter connector and hazard switch assembly connector.

      Connector and terminal 

      (i10) No. 12 - (i333) No. 14:

   Is the resistance less than 10 Ω?

   Yes  : Replace the hazard switch assembly. Ref. to LIGHTING SYSTEM>HAZARD SWITCH .

   No  : Repair the open circuit of harness between combination meter connector and hazard switch assembly connector.

4. CHECK CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the combination meter connector.
   3. Disconnect the hazard switch assembly connector.

   Is there any fault in the connector?

   Yes  : Repair or replace the connector.

   No  : 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.