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.
Diagnostic Test
- TEST FOR INTERMITTENT CONDITION NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
- Turn the ignition on.NOTE:
Make sure the battery voltage is between 10.0 and 16.0 volts.
- With the scan tool, read the module status.NOTE:
Check the BCM for any active CAN DTCs and perform the appropriate diagnostics before proceeding. Refer to DIAGNOSIS AND TESTING .
Does the scan tool indicate that the module is active on the bus?
Yes
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to DIAGNOSIS AND TESTING .
No
- Go To 2
- Turn the ignition on.
- CHECK THE (F938) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
- Disconnect the ADCM C2 harness connector.
- Using a 12-volt test light connected to ground, check the (F938) Fused Ignition Switch Output (Run-Start) circuit.
Does the test light illuminate brightly?
Yes
- Go To 3
No
- Repair the (F930) Fused Ignition Switch Output (Run-Start) circuit for an open or short.
- Perform the ADCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK THE (Z901) GROUND CIRCUIT FOR AN OPEN
- Turn the ignition off.
- Using a 12-volt test light connected to 12-volts, check the (Z901) Ground circuit.
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the (Z918) Ground circuit for an open.
- Perform the ADCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK THE (D153) CAN C(+) BUS CIRCUIT FOR AN OPEN
- Disconnect the ADCM C1 harness connector.
- Disconnect the Star Can C Body C5 harness connector.
- Measure the resistance of the (D153) CAN C Bus (+) circuit between the Star Can C Dash C5 harness connector and the ADCM C1 harness connector.
Is the resistances below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (D153) CAN C(+) Bus circuit for an open.
- Perform the ADCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK THE (D152) CAN C(-) BUS CIRCUIT FOR AN OPEN
- Measure the resistance of the (D152) CAN C Bus (-) circuit between the Star Can C Dash C5 harness connector and the ADCM C1 harness connector.
Are the resistances below 5.0 Ohms?
Yes
- Replace the Active Damping Control Module (ADCM) in accordance with the Service Information. Refer to MODULE, ACTIVE DAMPING CONTROL, REMOVAL .
- Perform the ADCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Repair the (D152) CAN C(-) Bus circuit for an open.
- Perform the ADCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- Measure the resistance of the (D152) CAN C Bus (-) circuit between the Star Can C Dash C5 harness connector and the ADCM C1 harness connector.
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.