B1612-PANEL ILLUMINATION CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the Ignition on, and the Panel Illumination active.
- Set Condition:
Panel Illumination Status HIGH.
| Possible Causes |
| (E2) PANEL LAMPS DRIVER CIRCUIT SHORTED TO GROUND |
| (E2) PANEL LAMPS DRIVER CIRCUIT SHORTED TO VOLTAGE |
| UPPER SWITCH BANK SHORTED TO GROUND |
| LOWER SWITCH BANK SHORTED TO GROUND |
| A/C HEATER CONTROL SHORTED TO GROUND |
| TRANSFER CASE SWITCH SHORTED TO GROUND |
| SHIFTER ASSEMBLY SHORTED TO GROUND |
| INSTRUMENT CLUSTER |
Diagnostic Test
1.CHECK FOR AN ACTIVE DTCIs the DTC 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. (Refer to BODY VERIFICATION TEST - VER 1).
2.CHECK THE UPPER SWITCH BANK FOR A SHORT TO GROUND
Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?
Yes
- Go To 3
No
- Replace the Upper Switch Bank in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
3.CHECK THE LOWER SWITCH BANK FOR A SHORT TO GROUND
Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?
Yes
- Go To 4
No
- Replace the Lower Switch Bank in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
4.CHECK THE A/C HEATER CONTROL FOR A SHORT TO GROUND
Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?
Yes
- Go To 5
No
- Replace the A/C Control in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
5.CHECK THE TRANSFER CASE SWITCH FOR A SHORT TO GROUND
Does the scan tool display: B1612-PANEL ILLUMINATION CONTROL CIRCUIT?
Yes
- Go To 6
No
- Replace the Transfer Case Switch in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
6.CHECK THE SHIFTER ASSEMBLY FOR A SHORT TO GROUND
Does the scan tool display- B1612-PANEL ILLUMINATION CONTROL CIRCUIT?
Yes
- Go To 7
No
- Replace the Shifter Assembly in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
7.CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND
Is the resistance less than 10K ohms?
Yes
- Repair the (E2) Panel Lamps Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).
No
- Go To 8
8.CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR AN OPEN
Is the resistance greater than 10K ohms?
Yes
- Repair the (E2) Panel Lamps Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).
No
- Go To 9
9.CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
Is the voltage above 5.0 volts?
Yes
- Repair the (E2) Panel Lamps Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).
No
- Replace the Instrument Cluster in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).