Malfunction Indicator Light Does Not Come On: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Malfunction Indicator Light - Wiring Diagram (Malfunction Indicator Light Does Not Come On)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK VEHICLE SPECIFICATION.	Is the vehicle except for C6 model?	Go to step 2 .	Go to step 3 .
2 CHECK DTC.	Is DTC of LAN system displayed? Refer to READ DIAGNOSTIC TROUBLE CODE (DTC)	Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to FUNCTION CHECK	Replace the meter case assembly of combination meter. Refer to COMBINATION METER
3 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 33 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 7 .	Go to step 4 .
4 CHECK HARNESS BETWEEN COMBINATION METER AND IGNITION SWITCH CONNECTOR. Turn the ignition switch to OFF. Remove the combination meter. Refer to COMBINATION METER Turn the ignition switch to ON. Measure the voltage between combination meter connector and chassis ground. Connector & terminal (i10) No. 2 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 5 .	Check the following item and repair if necessary. NOTE: Blown out of fuse Open circuit or short circuit to ground in harness of power supply circuit
5 CHECK HARNESS BETWEEN ECM AND COMBINATION METER CONNECTOR. Measure the resistance of harness between ECM and combination meter connector. Connector & terminal (B135) No. 33 - (i10) No. 38	Is the resistance less than 1 Ω?	Go to step 6 .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and combination meter connector Poor contact of coupling connector
6 CHECK FOR POOR CONTACT. Check for poor contact of combination meter connector.	Is there poor contact of combination meter connector?	Repair the poor contact of combination meter connector.	Replace the meter case assembly of combination meter. Refer to COMBINATION METER
7 CHECK ECM CONNECTOR. Check the connection of ECM connector.	Is the ECM connector correctly connected?	Go to step 8 .	Connect the ECM connector correctly.
8 CHECK FOR POOR CONTACT. Check for poor connection by shaking or pulling ECM connector and harness.	Does the malfunction indicator light illuminate?	Repair the poor contact of ECM connector.	Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM)