CHECK AMBIENT SENSOR POWER SUPPLY.

1) Disconnect the ambient sensor connector.

2) Turn the ignition switch to ON.

3) Measure the voltage between the ambient sensor connector and chassis ground.

Connector & terminal

(F78) No. 2 (+) — Chassis ground (−):

QUESTION

Is the voltage 4 V or more?

Yes No

Check the harness for a open or short between the fuse and clock.