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Home >> Jeep >> 2022 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> Electrical >> Gauges >> (Instrument Cluster - Electrical Diagnostics) >> DTC Troubleshooting >> B1612-00-Panel Illumination Control >> Diagnostic Test

Diagnostic Test

  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the recorded Environmental Data and the When Monitored Conditions, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

    Did the DTC return?

    Yes 

    • Go To  2

    No 

  2. CHECK FREQUENCY COUNTER (FC) AND IGNITION CYCLE (IC) COUNTER VALUES IN ENVIRONMENTAL DATA 
    1. Using the scan tool, check the Environmental Data Frequency counter (FC) and Ignition Cycle (IC) counter values.

      Review the following statements and select the appropriate choice:

      The Frequency counter (FC) is equal to 1 and the Ignition Cycle (IC) counter is equal to 0. 

      • Go To  3

      The Frequency counter (FC) is greater than 1 and the Ignition Cycle (IC) counter is equal to 0. 

      • Go To  9
  3. CHECK FREQUENCY COUNTER (FC) AND IGNITION CYCLE (IC) COUNTER VALUES IN ENVIRONMENTAL DATA AFTER PERFORMING 10 SLEEP CYCLES 
    1. Perform at least 10 Sleep Cycles (turn the ignition off until the bus is inactive, then turn the ignition on).
    2. Using the scan tool, check the Environmental Data Frequency counter (FC) and Ignition Cycle (IC) counter values.

      Review the following statements and select the appropriate choice:

      The Frequency counter (FC) is equal to 1 and the Ignition Cycle (IC) counter is equal to 0. 

      • Go To  4

      The Frequency counter (FC) is equal to or greater than 1 and the Ignition Cycle (IC) counter is equal to or greater than 1. 

      • Go To  9
  4. CHECK FOR RELATED DTCS IN THE BODY CONTROL MODULE (BCM) 
    1. Refer to the saved DTC information recorded on the repair order.

      Were any Instrument Panel Illumination related DTCs set in the BCM?

      Yes 

      No 

      • Go To  5
  5. CHECK THE (A108) FUSED B(+) CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component harness connector to isolate the 12.0 volt supply circuit.
    2. Connect the positive lead of the load test tool to the 12.0 volt supply circuit at the component harness connector (A). Note:  refer to the diagram below.
    3. Connect the negative lead of the load test tool to the ground circuit of the Battery or a good chassis ground.
    4. Ensure that the circuit being tested is being powered on. If the 12.0 volt circuit being tested is an ignition feed for example, the ignition must be on. If testing an output from a relay, verify that the relay is energized and on.
    5. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry.
    NOTE:

    Note: Why load test a circuit?  A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered  and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .

    NOTE:

    Note:  A 12-volt test light can be substituted for the load test tool, but only  if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps.

    NOTE:

    Note: Why perform a Voltage Drop Test?  To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following:

    • 1. Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
    • 2. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
    • 3. The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested.

    Example:  2.0 Ohms of resistance in the circuit being tested will cause the voltage measurement across the bulb to be 25% less than when compared to Battery voltage. The reason for this is that the 2.0 Ohms in the circuit makes up 25% of the total circuit resistance of 8.0 Ohms. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .

    GC0174938Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

    NOTE:

    Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery.

    Is the load test bulb illuminated and bright?

    Yes 

    • Go To  6

    No 

    • Repair the 12.0 volt circuit for an open or high resistance.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK INTERIOR LIGHTS WHILE ADJUSTING THE DIMMER SWITCH BETWEEN LOW AND HIGH 
    1. While monitoring all lights on the dimmer circuit, adjust the dimmer switch between low and high.
      NOTE:

      Depending on the vehicle options, this can include the cup holder, fuel door switch, media port and center console lamps.

      Do the interior lights on the dimmer circuit change appropriately while adjusting the dimmer switch?

      Yes 

      • Go To  7

      No 

      • Go To  8
  7. ISOLATE AND CHECK THE (E12) PANEL LAMP DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE BETWEEN THE INSTRUMENT PANEL CLUSTER (IPC) AND THE HEADLAMP SWITCH 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
    NOTE:

    When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

    Is the resistance below 3.0 Ohms?

    Yes 

    • Go To  9

    No 

    • Repair the circuit for an open or high resistance.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  8. ISOLATE AND CHECK THE (E12) PANEL LAMP DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE BETWEEN THE INSTRUMENT PANEL CLUSTER (IPC) AND THE HEADLAMP SWITCH IN ORDER TO VERIFY DIMMER SWITCH FUNCTIONALITY 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
    NOTE:

    When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

    Is the resistance below 3.0 Ohms?

    Yes 

    • Replace the Headlamp Dimmer Switch in accordance with the Service Information.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

    No 

    • Repair the circuit for an open or high resistance.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  9. CHECK RELATED HARNESS CONNECTIONS 
    1. Turn the ignition off.
    2. Disconnect all IPC harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.
      • Check fuse and replace if open.

      Repair any conditions that are found.

    6. Reconnect all IPC harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    11. With the scan tool, read IPC DTCs.

      Did the DTC return?

      Yes 

      No 

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