Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2009GRAND CHEROKEE OVERLAND, 3.0 M, 4WDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTWINDOW MOTORS & REGULATORS(CABIN COMPARTMENT NODE (CCN) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU1149-LOST COMMUNICATION WITH MULTI-FUNCTION SWITCHDIAGNOSTIC TEST
2009 Jeep Grand Cherokee Overland, 3.0 M, 4WD
Diagnostic Test
2009 Jeep Grand Cherokee Overland, 3.0 M, 4WDSECTION Diagnostic Test
- CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic process, verify the proper connection of the SCM C1 and C2 harness connectors. A loose connection at this connector will cause this DTC to set.
- Turn the ignition off.
- Gently pull the SCM C1 and S2 connector harness to verify the locking tab is fully engaged. If the connector locking tab is not fully engaged, push to seat the connector locking tab.
- Turn the ignition on.
- Wait 30 seconds.
- With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
- Go to step 2
No
- 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.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- (D500) LIN BUS CIRCUIT OPEN
- Turn the ignition off.
- Disconnect the Cluster C1, harness connector.
- Disconnect the Steering Control Module C1 and C2 harness connectors.
- Measure the resistance of the (D500) LIN Bus circuit between the Cluster and the Steering Control Module C1 and C2 harness connectors.
Is the resistance above 10K ohms?
Yes
- Repair the (D500) LIN Bus circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
No
- Replace the Steering Control Module in accordance with the service information.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
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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.