B1612

B1612-PANEL ILLUMINATION CONTROL CIRCUIT

B1612 - Panel Illumination Control Circuit:

WHEN MONITORED
With the ignition on and the Panel Illumination active.

SET CONDITION
Panel Illumination Status HIGH.

POSSIBLE CAUSES
- (E12) Panel lamps driver circuit shorted to ground
- (E12) Panel lamps driver circuit shorted to voltage
- (E12) Panel lamps driver circuit open
- Clock module shorted to ground
- PRNDL lamp shorted to ground
- A/C heater control shorted to ground
- Front window switch shorted to ground
- Instrument cluster

Diagnostic Test

1. CHECK FOR AN ACTIVE DTC

Turn the ignition on.
With the scan tool, record and erase DTCs.
Activate the Panel Illumination.
Wait 30 seconds.
With the scan tool, read DTCs.

Q: Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?

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 chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




2. CHECK THE CLOCK MODULE FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the Clock Module harness connector.
Turn the ignition on.
Activate the Panel Illumination.
With the scan tool, read DTCs.

Q: Does the scan tool display- B1612-PANEL ILLUMINATION CONTROL CIRCUIT?

YES: Go To 3
NO: Replace the Clock Module. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




3. CHECK THE A/C HEATER CONTROL FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the A/C Heater Control harness connector.
Turn the ignition on.
Activate the Panel Illumination.
With the scan tool, read DTCs.

Q: Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?

YES: Go To 4
NO: Replace the A/C Control. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




4. CHECK THE PRNDL LAMP FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the PRNDL Lamp harness connector.
Turn the ignition on.
Activate the Panel Illumination.
With the scan tool, read DTCs.

Q: Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?

YES: Go To 5
NO: Replace the PRNDL Lamp. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




5. CHECK THE FRONT WINDOW SWITCH FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the Front Window Switch harness connector.
Turn the ignition on.
Activate the Panel Illumination.
With the scan tool, read DTCs.

Q: Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?

YES: Go To 6
NO: Replace the Front Window Switch. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test




6. CHECK THE (E12) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
With all the above components disconnected, measure the resistance to ground of the (E12) Panel Lamps Driver Circuit from the Instrument Cluster C1 harness connector.

Q: Is the resistance less than 10K ohms?

YES: Repair the (E12) Panel Lamps Driver circuit for a short to ground. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7




7. CHECK THE (E12) PANEL LAMPS DRIVER CIRCUIT FOR AN OPEN

With all the above components disconnected, measure the resistance of the (E12) Panel Lamps Driver Circuit between the Instrument Cluster C1 harness connector and the Window Switch harness connector.

Q: Is the resistance greater than 10K ohms?

YES: Repair the (E12) Panel Lamps Driver circuit for an open. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8




8. CHECK THE (E12) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO VOLTAGE

Turn the ignition on.
With all the above components disconnected, measure the voltage of the (E12) Panel Lamps Driver Circuit from the Instrument Cluster C1 harness connector.

Q: Is the voltage above 5.0 volts?

YES: Repair the (E12) Panel Lamps Driver circuit for a short to voltage. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Instrument Cluster. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test