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Home >> Chrysler >> 2001 >> Sebring LX, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Air Bag Restraint Systems - Coupe) >> SRS Air Bag Diagnosis >> Diagnostic Trouble Code Procedures >> DTC 42: IG1 Power Supply Circuit System (Fuse No.22 Circuit) >> Diagnosis

DTC 42: IG1 Power Supply Circuit System (Fuse No.22 Circuit): Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. STEP 1. Check the junction block multi-purpose fuse number 22. 

    Q: Is the fuse burned out? 

    YES  : Go to  Step 4.

    NO:  Go to Step 2.

    Fig 1: Identifying Junction Block Multi-Purpose Fuse Number 22
    G04537765Courtesy of DAIMLERCHRYSLER CORPORATION
  2. STEP 2. Check the power supply circuit for open circuit at the SRS-ECU connector C-137. 
    1. Disconnect the negative battery terminal.
    2. Disconnect the SRS-ECU connector C-137.
    3. Connect the negative battery terminal.
    4. Turn the ignition switch to the "ON" position.
      Fig 2: Identifying SRS-ECU Connector C-137
      G04537766Courtesy of DAIMLERCHRYSLER CORPORATION
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
    5. Measure the voltage between the C-137 harness side connector terminal 9 and body ground. Voltage should be 9 volts or more.

    Q: Is the measured voltage within the specified range? 

    YES  : Erase the DTC memory, and recheck if any DTC sets. If DTC 42 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ). Then go to  Step 8.

    NO:  Go to Step 3.

    Fig 3: Measuring Voltage Between C-137 Harness Side Connector Terminal 9 And Body Ground
    G04537767Courtesy of DAIMLERCHRYSLER CORPORATION
  3. STEP 3. Check the harness wire for open circuit between the SRS-ECU connector C-137 (terminal No.9) and the ignition switch connector C-202 (terminal No.2). 
    NOTE: After inspecting the intermediate connectors C-308 and C-311, inspect the wiring harness. If the intermediate connector C-308 or -311 is damaged, repair or replace it. Refer to , HARNESS CONNECTOR INSPECTION . Then go to  Step 8.
    Fig 4: Identifying Connectors C-308, C-311
    G04537768Courtesy of DAIMLERCHRYSLER CORPORATION

    Q: Is the harness wire between the SRS-ECU connector C-137 (terminal No.9) and the ignition switch connector C-202 (terminal No.2) in good condition? 

    YES  : Go to  Step 8.

    NO:  Repair the harness wire between the SRS-ECU connector C-137 and the ignition switch connector C-202. Then go to  Step 8.

    Fig 5: Identifying Connector C-137
    G04537769Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 6: Identifying Connector C-202
    G04537770Courtesy of DAIMLERCHRYSLER CORPORATION
  4. STEP 4. Check a burned-out fuse. 
    1. Replace the fuse.
    2. Turn the ignition switch to the "ON" position, wait for at least one minute and then turn the ignition switch to the "LOCK" (OFF) position.
    3. Check the fuse.

    Q: Is the fuse in good condition? 

    YES  : Go to  Step 8.

    NO:  Go to Step 5.

  5. STEP 5. Check the SRS-ECU power supply circuit for short circuit to ground at the junction block connector C-308. 
    1. Disconnect the junction block connector C-308, and measure at the harness side connector.
      Fig 7: Identifying Connector C-308
      G04537771Courtesy of DAIMLERCHRYSLER CORPORATION
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
    2. Check for continuity between the terminal 7 and body ground.

      It should be open circuit.

    Q: Does continuity exist? 

    YES  : Go to Step 6.

    NO:  Check the other circuit, which flows through the multi-purpose fuse number 22.

    Fig 8: Checking Continuity Between Terminal 7 And Body Ground
    G04537772Courtesy of DAIMLERCHRYSLER CORPORATION
  6. STEP 6. Check the power supply circuit for short circuit to ground at the SRS-ECU connector C-137. 
    1. Disconnect the SRS-ECU connector C-137, and measure at the harness side connector.
      Fig 9: Identifying SRS-ECU Connector C-137
      G04537773Courtesy of DAIMLERCHRYSLER CORPORATION
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
    2. Check for continuity between the terminal 9 and body ground.

      It should be open circuit.

    Q: Does continuity exist? 

    YES  : Go to Step 7.

    NO:  Erase the DTC memory, and recheck if any DTC sets. If DTC 42 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ). Then go to  Step 8.

    Fig 10: Checking Continuity Between Terminal 9 And Body Ground
    G04537774Courtesy of DAIMLERCHRYSLER CORPORATION
  7. STEP 7. Check the harness wire for short circuit to ground between the SRS-ECU connector C-137 (terminal No.9) and the junction block connector C-308 (terminal No.7). 

    Q: Is the harness wire between the SRS-ECU connector C-137 (terminal No.9) and the junction block connector C-308 (terminal No.7) in good condition? 

    YES  : Go to Step 8.

    NO:  Repair the harness wire between the SRS-ECU connector C-137 and the junction block connector C-308. Then go to Step 8.

    Fig 11: Identifying Connector C-137
    G04537775Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 12: Identifying Connector C-308
    G04537776Courtesy of DAIMLERCHRYSLER CORPORATION
  8. STEP 8. Check for DTC. 

    Q: Is DTC 42 set? 

    YES  : Return to  Step 1.

    NO:  The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to TO COPE WITH INTERMITTENT MALFUNCTION ).

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