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

DTC DETECTING CONDITION:

There is a malfunction in the output circuit from the power supply CM to the accessory.

TROUBLE SYMPTOM:

Systems do not operate at the ACC position.

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 fuse (FB-18).	Is the fuse blown out?	Replace the fuse (FB-18). If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and body integrated unit.
2.CONTINUITY CHECK OF WIRING HARNESS. 1) Disconnect connector (B420) from the power supply CM. 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 or replace the open circuit of harness.
3.CHECK CONNECTOR WIRING HARNESS. Using a tester, 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 or replace the open circuit of harness.
4.CHECK WIRING HARNESS. Using a tester, check continuity between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 11 — Chassis ground:	Is there continuity?		Repair or replace the short circuit of the harness.
5.CHECK ACCESSORY RELAY (PUSH BUTTON START). 1) Remove the accessory relay (push button start). 2) Check the accessory relay (push button start).	Is the relay OK?		Replace the accessory relay (push button start).
6.CHECK CONNECTOR WIRING HARNESS. 1) Connect the disconnected power supply CM connectors. 2) Using a tester, measure the voltage between the power supply CM terminal and chassis ground when the ignition switch is turned from OFF to ACC ON. Connector & terminal (B420) No. 11 (+) — Chassis ground (−):	Did the voltage change from less than 1 V to +B−2 V or more?	System is normal. It is possible that a temporary poor contact occurs.	Replace the power supply CM.