Downhill Assist Control Operation Switch (Test Mode DTC) - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1379/74: Downhill Assist Control Operation Switch (Test Mode DTC)

DTC C1379/74 - Downhill Assist Control Operation Switch (Test Mode DTC)

DESCRIPTION

The downhill assist control switch is connected to the skid control ECU in the ABS and TRACTION actuator.
DTC C1379/74 can be detected when the downhill assist control switch sends the downhill assist control switch signal or test mode ends. DTC C1379/74 is output only in test mode.






WIRING DIAGRAM

Refer to downhill assist control switch circuit .

INSPECTION PROCEDURE
NOTE: When replacing the ABS and TRACTION actuator, perform zero point calibration .

PROCEDURE

1. CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND)





(a) Disconnect the A19 ECU.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
NG -- Continue to next step.
2. INSPECT DOWNHILL ASSIST CONTROL SWITCH





(a) Remove the downhill assist control switch.
(b) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE DOWNHILL ASSIST CONTROL SWITCH
OK -- Continue to next step.
3. CHECK WIRE HARNESS (SKID CONTROL ECU - DOWNHILL ASSIST CONTROL SWITCH)





(a) Disconnect the A19 ECU connector.
(b) Disconnect the E31 switch connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY