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HOMESERVICE MANUALSJEEP2007GRAND CHEROKEE LIMITED, 5.7 2, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTING*NO RESPONSE FROM LRSM (RAIN SENSOR)DIAGNOSTIC TEST
2007 Jeep Grand Cherokee Limited, 5.7 2, 4WD

Diagnostic Test

2007 Jeep Grand Cherokee Limited, 5.7 2, 4WDSECTION 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) (A934) FUSED RUN/ACCESSORY RELAY OUTPUT CIRCUIT OPEN OR SHORTED 
    Fig 1: Checking Fused Run/Accessory Relay Output Circuit
    GC0027548Courtesy of CHRYSLER LLC
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.