B160B

B160B-PANEL DIMMER INPUT CIRCUIT HIGH





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the Cluster awake.

- Set Condition:
Panel Dimmer Input voltage greater than 4.8 volts.





1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT, AND THE (L900) HEADLAMP SWITCH RETURN CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Dimmer Switch and harness connector.
3. Turn the ignition on.
4. Measure for voltage on the (E2) Panel Lamps Dimmer Signal circuit.
5. Measure for voltage on the (L900) Headlamp Switch Return circuit.

Is the voltage greater than 5 volts on the (E2) or (L900) circuit?

Yes

- Repair the (E2) or the (L900) for a short to voltage.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 3

3. CHECK THE OPERATION OF THE DIMMER SWITCH
1. Turn the ignition off.
2. Connect a jumper wire at the Dimmer Switch harness connector between the (E2) Panel Lamps Dimmer Signal circuit and the (L900) Headlamp Switch Return circuit.
3. Turn the ignition on.
4. With the scan tool, read DTCs.

Does the scan tool display-B160A-PANEL DIMMER INPUT CIRCUIT LOW?

Yes

- Replace the Dimmer Switch. Dimmer Switch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK THE (L900) HEADLAMP SWITCH RETURN CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Cluster C1 harness connector.
3. Measure the resistance of the (L900) Headlamp Switch Return circuit between the Cluster C1 and Dimmer Switch harness connectors.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (L900) Headlamp Switch Return circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR AN OPEN
1. Measure the resistance of the (E2) Panel Lamps Dimmer Signal circuit between the Cluster C1 and the Dimmer Switch harness connectors.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (E2) Panel Lamps Dimmer Signal circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Cluster. Instrument Cluster - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.