Diagnostic Test
- 1) ACTIVE DTC NOTE: Diagnose all CAN B and C communication failures before continuing.
Ignition on, engine not running.
With 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 ACC MODULE VERIFICATION TEST . See STANDARD PROCEDURE .
- 2) FCM ACTIVE ON THE CAN C BUS
With the scan tool, select ECU View.
Verify that the FCM active on the bus.
Is the FCM active on the bus?
Yes
- Go To 3).
No
Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS for diagnostic procedures and for further possible causes.
- 3) DTCS STORED OR ACTIVE IN THE FCM
Are any DTCs active or stored in the FCM Module?
Yes
- Refer to the appropriate section and perform the diagnostics for the DTCs.
No
- Replace and program the ACC Module in accordance with the Service Information.
- Perform ACC MODULE VERIFICATION TEST . See STANDARD PROCEDURE .