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Home >> Jeep >> 2006 >> Commander Base, 4.7 N, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Electronic Control Modules - Electrical Diagnostics >> DTC Troubleshooting >> *No Response From OCM (Occupant Classification Module) >> Diagnostic Test
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Diagnostic Test

  1. 1) TEST FOR INTERMITTENT CONDITION 

    Turn the ignition on.

    NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

    With the scan tool, select ECU view.

    NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

    Does the scan tool display a red X next to the module? 

    Yes 

    1. Go To step  2).

    No 

    1. The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  2. 2) (A27) FUSED B(+) CIRCUIT OPEN OR SHORTED 
    Fig 1: Checking Fused B(+) Circuit
    GC0027556Courtesy of DAIMLERCHRYSLER CORP.
    WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

    Disconnect the Occupant Classification Module C1 harness connector.

    WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.

    Using a 12-volt test light connected to ground, check the (A27) Fused B(+) circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  3).

    No 

    1. Repair the (A27) Fused B(+) circuit for an open or short.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
  3. 3) (Z105) GROUND CIRCUIT OPEN 
    Fig 2: Checking Ground Circuit
    GC0027557Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Using a 12-volt test light connected to 12-volts, check the (Z105) ground circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the (Z105) ground circuit for an open.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
  4. 4) (F200) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED 
    Fig 3: Checking Fused Ignition Switch Output Circuit
    GC0027558Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    Using a 12-volt test light connected to ground, check the (F200) Fused Ignition Switch Output circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the (F200) Fused Ignition Switch Output circuit for an open or short.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
  5. 5) (D55) AND (D54) CAN B BUS CIRCUITS OPEN 
    Fig 4: Checking CAN B BUS Circuits
    GC0027559Courtesy of DAIMLERCHRYSLER CORP.
    WARNING: If the Occupant Classification Module is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and personal injury or death.
    NOTE: One open circuit will not cause this condition.

    Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

    Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

    Is there any voltage present on either circuit? 

    Yes 

    1. Go To step  6).

    No 

    1. Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
  6. 6) CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO GROUND 

    Turn the ignition off.

    Measure the resistance between ground and the (R263) Driver Seat Position Sensor Voltage-Driver circuit.

    Is the resistance below 10k ohms? 

    Yes 

    NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.
    1. Replace the OCM and Driver Seat Position Sensor Harness in accordance with the service information.
    2. Perform *OCS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  7).
  7. 7) CHECK (R726) SEAT WEIGHT SENSOR 5 VOLT CIRCUIT FOR A SHORT TO GROUND 

    Disconnect the Occupant Classification Module C2 harness connector.

    Measure the resistance between ground and the (R726) Seat Weight Sensor 5 volt circuit.

    Is the resistance below 10k ohms? 

    Yes 

    NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.
    1. Replace the OCM and Driver Seat Position Sensor Harness in accordance with the service information.
    2. Perform *OCS VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Occupant Classification Module in accordance with the service information.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
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