CHECK POWER SUPPLY CIRCUIT.

1) Disconnect the key warning switch harness connector.

2) Set the ignition switch to ACC or LOCK (with key inserted).

3) Measure the voltage between the key warning switch harness connector terminal and chassis ground.

Connector & terminal

(B350) No. 3 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Check for an open or short circuit in the harness between the key warning switch and fuse.