PWM Dimming Output Failure

PWM DIMMING OUTPUT FAILURE





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
When the Instrument Cluster is powered up.

- Set Condition:
This DTC will set when the Instrument Cluster detects the Panel Lamps Dimming output is On and an open circuit, short to power or ground condition exists on the Panel Lamps Driver circuit for 2 seconds.





Diagnostic Test

1. CHECK FOR AN ACTIVE DTC
Turn the ignition on.
With the scan tool, record and erase DTCs.
Wait 30 seconds.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?

Yes

- Go To 2

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 - VER 1. Body Verification Test

2. (E12) PANEL LAMPS DRIVER CIRCUIT OPEN

NOTE: This DTC will set if the Panel Lamps Driver circuit is open to all dimmed components.

Turn the ignition off.
Disconnect the Cluster C1 harness connector.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors related to the Panel Lamps Driver circuit for an open circuit condition.
Was a (E12) Panel Lamps Driver circuit open condition found?

Yes

- Repair the Panel Lamps Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To3

3. (E12) PANEL LAMPS DRIVER CIRCUIT SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Measure the voltage between the (E12) Panel Lamps Driver circuit and ground.
Is there any voltage present?

Yes

- Repair the (E12) Panel Lamps Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To4

4. DIMMED COMPONENT SHORTED
Turn the ignition on, with the scan tool, erase DTCs.
Turn the ignition off.
Using the wiring diagram/schematic as a guide, disconnect one of the dimmed components.
Turn the ignition on, with the scan tool, read DTCs.
If the scan tool continues to display an active code, repeat the above procedure with each dimmed component on the (E12) Panel Lamps Driver circuit.
Was a dimmed component found to be shorted, changing the DTC from active to stored?

Yes

- Replace the appropriate dimmed component.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To5

5. (E12) PANEL LAMPS DRIVER CIRCUIT SHORT TO GROUND




Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the (E12) Panel Lamps Driver circuit.
Is the resistance below 10K ohms?

Yes

- Repair the (E12) Panel Lamps Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Instrument Cluster.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test