CHECK POWER SUPPLY CIRCUIT.

1) Disconnect the harness connector from key warning switch.

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

3) Measure the voltage between 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 the harness for an open or short between the key warning switch and fuse.