Circuit Description
The distance sensing cruise control module (DSCC) communicates with the radar forward looking sensor (FLS) via controller area network (CAN) serial data. When there is an internal fault in the FLS, this DTC will set in the DSCC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1020 Auxiliary Electronic Control Unit (ECU) Performance
This vehicle has DTCs which include DTC Symptoms. For more information on DTC symptoms, refer to Symptoms - Vehicle .
DTC Symptom | DTC Symptom Descriptor |
|---|---|
3C | Internal Communications Failure |
Conditions for Running the DTC
The DSCC runs the program to detect a fault when power up is commanded.
Conditions for Setting the DTC
The module has detected a fault with the FLS while cruise is engaged or attempted to be engaged.
Action Taken When the DTC Sets
Adaptive cruise control (ACC) is inoperative.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Diagnostic Aids
This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Is DTC retrieved as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 | Inspect for poor connections at the harness connector of the forward looking sensor (FLS). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
4 | Replace the FLS. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 2 | System OK |
