Adaptive Cruise Control Module (ACC)

C212A-84-SYSTEM VOLTAGE - SIGNAL BELOW ALLOWABLE RANGE





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The Adaptive Cruise Control (ACC) module receives a low charging system voltage message over the CAN Bus or detects voltage under 10 volts on the (F943) Fused B(+) circuit.





1. CHECK PCM FOR CHARGING SYSTEM DTC
1. With the scan tool, read the PCM DTCs.

Are there any Charging System DTCs set in the PCM?

Yes

- Perform the Charging System diagnostic procedure. Testing and Inspection.

No

- Go To 2

2. CHECK FOR AN ACTIVE DTC
1. With the scan tool, read the active ACC module DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

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.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.

3. CHECK THE VOLTAGE AT THE (F943) FUSED B(+) CIRCUIT




1. Disconnect the ACC module harness connector.
2. Turn the ignition on.
3. Using a 12-volt test light connected to ground, check the (F943) Fused Ignition Switch Output (Run-Start) circuit.

Does the test light illuminate brightly?

Yes

- Replace and program the Adaptive Cruise Control (ACC).
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.

No

- Repair the (F943) Fused B(+) circuit as necessary.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.