B160B

B160B - Panel Dimmer Input Circuit High






For a complete wiring diagram, refer to.

• When Monitored: With the cluster awake.

• Set Condition: Panel dimmer input greater than 4.8 volts.






Test Step 1 - Check for an Active DTC

• Turn the ignition ON.

• With the scan tool, record and erase DTCs.

• Activate the panel dimmer switch.

• Wait 30 seconds.

• With the scan tool, read DTCs.

Is the DTC active?

Yes

• Go to Test Step 2 => [ Test Step 2 - Check the Panel Lamps Dimmer Signal Circuit, and the
Headlamp Switch Return Circuit for a Short to Voltage ]

No

• The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior

Test Step 2 - Check the Panel Lamps Dimmer Signal Circuit, and the Headlamp Switch Return Circuit for a Short to Voltage






• Turn the ignition OFF.

• Disconnect the headlamp switch and cluster C2 harness connectors.

• Turn the ignition ON.

• Measure for voltage on the panel lamps dimmer signal circuit.

• Measure for voltage on the headlamp switch return circuit.

Is the voltage greater than 5 volts on the either circuit?

Yes

• Repair the applicable circuit for a short to voltage.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior

No

• Go to Test Step 3 => [ Test Step 3 - Check the Operation of the Panel Lamps Dimmer Switch ]

Test Step 3 - Check the Operation of the Panel Lamps Dimmer Switch






• Turn the ignition OFF.

• Reconnect the cluster C2 harness connector.

• Connect a jumper wire at the headlamp switch harness connector between the panel lamps dimmer signal circuit and the headlamp switch return circuit.

• Turn the ignition ON.

• With the scan tool, read DTCs.

Does the scan tool display B160A - Panel Dimmer Input Circuit Low?

Yes

• Replace the headlamp switch.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior

No

• Go to Test Step 4 => [ Test Step 4 - Check the Headlamp Switch Return Circuit for an Open ]

Test Step 4 - Check the Headlamp Switch Return Circuit for an Open






• Turn the ignition OFF.

• Disconnect the cluster C2 harness connector.

• Measure the resistance of the headlamp switch return circuit between the cluster C2 harness connector and the headlamp switch harness connector.

Is the resistance above 5.0 ohms?

Yes

• Repair the headlamp switch return circuit for an open.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior

No

• Go to Test Step 5 => [ Test Step 5 - Check the Panel Lamps Dimmer Signal Circuit for an
Open ]

Test Step 5 - Check the Panel Lamps Dimmer Signal Circuit for an Open






• Measure the resistance of the panel lamps dimmer signal circuit between the cluster C2 harness connector and the headlamp switch harness connector.

Is the resistance above 5.0 ohms?

Yes

• Repair the panel lamps dimmer signal circuit for an open.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior

No

• Replace the instrument cluster.

• Perform Body Verification Test. Refer to => Non
- DTC Based Diagnostics. Body Interior