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Home >> Jeep >> 2006 >> Commander Base, 3.7 K, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster - Electrical Diagnostics >> DTC Troubleshooting >> B1612-Panel Illumination Control Circuit >> Diagnostic Test

Diagnostic Test

  1. 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.

    Is the DTC active? 

    Yes 

    1. Go To  2).

    No 

    1. 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.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. 2) CHECK THE UPPER SWITCH BANK FOR A SHORT TO GROUND 
    Fig 1: Checking Upper Switch Bank
    GC0029131Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Upper Switch Bank harness connector.

    Turn the ignition on.

    Activate the Panel Illumination.

    With the scan tool, read DTCs.

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

    Yes 

    1. Go To  3).

    No 

    1. Replace the Upper Switch Bank in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. 3) CHECK THE LOWER SWITCH BANK FOR A SHORT TO GROUND 
    Fig 2: Checking Lower Switch Bank
    GC0029132Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Lower Switch Bank harness connector.

    Turn the ignition on.

    Activate the Panel Illumination.

    With the scan tool, read DTCs.

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

    Yes 

    1. Go To  4).

    No 

    1. Replace the Lower Switch Bank in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. 4) CHECK THE A/C HEATER CONTROL FOR A SHORT TO GROUND 
    Fig 3: Checking A/C Heater Control
    GC0029133Courtesy of DAIMLERCHRYSLER CORP.

    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.

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

    Yes 

    1. Go To  5).

    No 

    1. Replace the A/C Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  5. 5) CHECK THE TRANSFER CASE SWITCH FOR A SHORT TO GROUND 
    Fig 4: Checking Transfer Case Switch
    GC0029134Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Transfer Case Switch harness connector.

    Turn the ignition on.

    Activate the Panel Illumination.

    With the scan tool, read DTCs.

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

    Yes 

    1. Go To  6).

    No 

    1. Replace the Transfer Case Switch in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  6. 6) CHECK THE SHIFTER ASSEMBLY FOR A SHORT TO GROUND 
    Fig 5: Checking Shifter Assembly
    GC0029135Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Shifter Assembly harness connector.

    Turn the ignition on.

    Activate the Panel Illumination.

    With the scan tool, read DTCs.

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

    Yes 

    1. Go To  7).

    No 

    1. Replace the Shifter Assembly in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  7. 7) CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND 
    Fig 6: Checking Panel Lamps Driver Circuit
    GC0029136Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Instrument Cluster C2 harness connector.

    With all the above components disconnected, measure the resistance to ground of the (E2) Panel Lamps Driver Circuit from the Instrument Cluster C2 harness connector.

    Is the resistance less than 10K ohms? 

    Yes 

    1. Repair the (E2) Panel Lamps Driver circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  8).
  8. 8) CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR AN OPEN  
    Fig 7: Checking Panel Lamps Driver Circuit
    GC0029137Courtesy of DAIMLERCHRYSLER CORP.

    With all the above components disconnected, measure the resistance of the (E2) Panel Lamps Driver Circuit between the Instrument Cluster C2 harness connector and the Upper Switch Bank harness connector.

    Is the resistance greater than 10K ohms? 

    Yes 

    1. Repair the (E2) Panel Lamps Driver circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  9).
  9. 9) CHECK THE (E2) PANEL LAMPS DRIVER CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 8: Checking Panel Lamps Driver Circuit
    GC0029138Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    With all the above components disconnected, measure the voltage of the (E2) Panel Lamps Driver Circuit from the Instrument Cluster C2 harness connector.

    Is the voltage above 5.0 volts? 

    Yes 

    1. Repair the (E2) Panel Lamps Driver circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Instrument Cluster in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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