Adaptive Cruise Control Module (ACC)

U0429-IMPLAUSIBLE DATA RECEIVED FROM SCM

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

- When Monitored:
Continuously monitored with the engine running and the ACC Module in normal mode.

- Set Condition:
The ACC Module receives an implausible (default/error value or toggle error or parity error are present) message from the SCM for 60 to 180 millisecond. The ACC module will disable the ACC system and the ACC UNAVAILABLE message will display in the Cabin Compartment Node (CCN). Once the Diagnostic Trouble Code (DTC) goes to stored, the ACC system will return to normal operation. The DTC will be cleared after the ACC Module sees 100 consecutive key cycles of the STORED DTC.





For gasoline engines, always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. VERIFY DTC IS ACTIVE

NOTE: Diagnose all CAN B and C communication failures before continuing.

1. Ignition on, engine not running.
2. Using a scan tool, read ACC DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors, pay particulate attention the CAN circuits.
- Perform ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.

2. VERIFY SCM IS ACTIVE ON CAN C BUS
1. Using a scan tool, select ECU View.
2. Verify that the SCM is active on the bus.

Is the SCM active on the bus?

Yes

- Go To 3

No

- Perform the No Response from SCM diagnostic procedure. No Response From SCM (Steering Control Module)

3. CHECK FOR ACTIVE OR STORED DTCs IN SCM
1. Using a scan tool, read SCM DTCs.

Are any DTCs active or stored in the SCM?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 4

4. CHECK FOR ACTIVE OR STORED COMMUNICATION DTCs IN TIPM
1. Using a scan tool, read TIPM DTCs.

Are any active or stored SCM Communication DTCs set in the TIPM?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 5

5. CHECK FOR STUCK SPEED CONTROL SWITCH (CRUISE CONTROL STALK)

NOTE: There is a possibility that the Speed Control Switch has internal damages causing a jammed signal to be sent to both the Steering Control Module (SCM) and Adaptive Cruise Control (ACC) module. Using a scan tool, read the Speed Control Switch Inputs to the SCM to verify if a stuck switch condition exits.

1. Using a scan tool, select Data Display in SCM and then select Cruise Control Status and Cruise Control from the Inputs Menu.
2. The Cruise Control input Status changes when the Cruise Stalk On/Off button is pressed and released. Normally, the status should read Set when the button is pressed and Not Set when the button is not pressed. Operate the switch. If the input status does not correspond to the switch position as specified, the switch is jammed.
3. The Cruise Control Status input status changes for each Cruise Stalk function position. Normally, the status should read None (when not moved), Cancel (when in CANCEL position), Set (when in DISTANCE position), Acc/Res (when in ACCEL/RESUME position), and Coast (when in DECEL/SET position). Operate the switch in each position. If the input status does not correspond to the switch position as specified, the switch is jammed.

Does the input status correspond to the switch position as specified?

Yes

- Replace and program the ACC Module.
- Perform ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.

No

- Replace the Speed Control Switch.
- Perform ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.