C1379

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1379: Downhill Assist Control Switch Malfunction (Test Mode DTC)
C1379 - Downhill Assist Control Switch Malfunction (Test Mode DTC)

DESCRIPTION

DTC C1379 will be cleared when the downhill assist control switch sends a downhill assist control operation signal or when Test Mode ends. DTC C1379 is stored only in Test Mode.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Component Tests and General Diagnostics.

PROCEDURE

1. READ VALUE USING TECHSTREAM (DOWNHILL ASSIST CONTROL SWITCH)

(a) Check the Data List for proper functioning of the downhill assist control switch.

ABS/VSC/TRAC:





OK:

The Techstream displays ON or OFF according to downhill assist control switch operation.

NG -- INSPECT DOWNHILL ASSIST CONTROL SWITCH
OK -- Continue to next step.

2. PERFORM TEST MODE (SIGNAL CHECK)

(a) Turn the ignition switch off.

(b) Perform the sensor check in the Test Mode procedure Test Mode Procedure.

OK:

All Test Mode DTCs are cleared.

HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

3. INSPECT DOWNHILL ASSIST CONTROL SWITCH

(a) Turn the ignition switch off.





(b) Make sure that there is no looseness in the locking part and connecting part of the connector.

(c) Disconnect the downhill assist control switch connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NOTICE:
Check the downhill assist control switch signal after replacement Test Mode Procedure.

NG -- REPLACE DOWNHILL ASSIST CONTROL SWITCH Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (DOWNHILL ASSIST CONTROL SW - SKID CONTROL ECU/BODY GROUND)

(a) Disconnect the skid control ECU connector.





(b) Disconnect the downhill assist control switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal