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.
2012 Jeep Compass Limited, FWD, StandardFACTORY OEM SERVICE PROCEDURE
Diagnostic Test
- CHECK FOR AN ACTIVE DTC
- Turn the ignition on.
- With the scan tool, read DTCs.
Does the scan tool display: U0161-LOST COMMUNICATION WITH COMPASS MODULE?
Yes
- Go To 2.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- (D506) LIN BUS CIRCUIT OPEN
- (D506) LIN BUS CIRCUIT OPEN
- Turn the ignition off.
- Disconnect the Cluster C3 harness connector.
- Measure the resistance of the (D506) LIN BUS circuit.
Is the resistance below 5.0 Ohms?
Yes
- Replace the Cluster in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
No
- Repair the open in the (D506) LIN BUS circuit.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
- (F929) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN
- Measure the voltage of the (F929) Fused Ignition Switch Output (RUN) circuit.
Is the voltage above 10.0 volts?
Yes
- Go To 5.
No
- Repair the open in the (F929) Fused Ignition Switch Output (RUN) circuit.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
- Measure the voltage of the (F929) Fused Ignition Switch Output (RUN) circuit.
- (Z903) GROUND CIRCUIT OPEN
- Measure the resistance between ground and the (Z903) Ground circuit.
Is the resistance below 10K Ohms?
Yes
- Replace the Compass Module in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
No
- Repair the open in the (Z903) Ground circuit.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
- Measure the resistance between ground and the (Z903) Ground circuit.
Factory Service Tools
Use the Manual With the Right Hardware
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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.