KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

Fuse blown, open or short circuit in the harness from the fuse to the power supply CM, or there is a short in the IG system internal circuit of the power supply CM or between the power supply CM and the relay.

TROUBLE SYMPTOM:

• Not all functions operate at ignition ON.

• IG relay 1 (push button start), or IG relay 2 (push button start), accessory relay (push button start) do not operate.

CAUTION:

When the power supply CM is replaced with a new unit, and the battery ground terminal is connected, it will become ignition ON. Also, if the battery is disconnected, it will resume to a condition with the battery cut off.

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK FUSE. 1) Turn the ignition switch to OFF. 2) Check the fuse (FB-18 No. 7).	Is the fuse blown out?	Replace the fuse.
2.CHECK HARNESS. 1) Disconnect the power supply CM connector (B420). 2) Measure the voltage between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 12 — Chassis ground: (B420) No. 33 — Chassis ground:	Is the voltage 10 V or more?		Repair the open or shorted circuit of harness.
3.CHECK HARNESS. Check continuity between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 6 — Chassis ground: (B420) No. 40 — Chassis ground:	Is there continuity?		Repair the open circuit of harness or replace harness.
4.CHECK IG RELAY 1 (PUSH BUTTON START). 1) Remove IG relay 1 (Push button start). 2) Check IG relay 1 (Push button start).	Is the relay OK?		Replace the relay.
5.CHECK IG RELAY 2 (PUSH BUTTON START). 1) Remove IG relay 2 (Push button start). 2) Check IG relay 2 (Push button start).	Is the relay OK?		Replace the relay.
6.CHECK HARNESS. Measure the continuity between the relay holder terminal and the power supply CM connector. Connector & terminal (B420) No. 34 — (B425) No. 34: (B420) No. 35 — (B425) No. 38:	Is there continuity?		Repair or replace the open circuit of harness.
7.CHECK POWER SUPPLY CM. 1) Connect the power supply CM connector, and attach IG relay 1 (push button start) and IG relay 2 (push button start). 2) Using a tester, measure the voltage between the back of the power supply CM connector and the terminal and chassis ground when the ignition switch is turned from OFF to ON. Connector & terminal (B420) No. 34 (+) — Chassis ground (−): (B420) No. 35 (+) — Chassis ground (−):	Did the voltage change from 1 V or less to +B−2 V or more?	System is normal.	Replace the power supply CM.