GM Service Manual Online
For 1990-2009 cars only

Clock Malfunction

Checks

Actions

An open or a short in the power supply circuit to the fuse Ef2 regardless of the ignition position.

Repair or replace the power supply circuit wiring harness.

An open or a short in the power supply circuit to the fuse F1 with the ignition position I.

Repair or replace the power supply circuit wiring harness.

An open or a short in the power supply circuit to the fuse Ef12 with the interior courtesy lamp ON.

Repair or replace the power supply circuit wiring harness.

The circuit between the fuse Ef2 and the fuse F12 is open or short.

Repair or replace the wiring harness.

Fuse Ef2, Ef12, F1 or F12 is blown.

Replace the fuse.

The circuit between the fuse F12 and the digital clock connector is open or short.

Repair or replace the wiring harness.

The circuit between the fuse F1 and the digital clock connector is open or short.

Repair or replace the wiring harness.

The circuit between the Ef12 and the digital clock connector is open or short.

Repair or replace the wiring harness.

A faulty digital clock

Replace the digital clock.

An open ground (G201) circuit.

Repair the open ground circuit.