Downhill Assist Control Indicator Light Remains On

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: Downhill Assist Control Indicator Light Remains ON

Downhill Assist Control Indicator Light Remains ON

DESCRIPTION

When the downhill assist control switch is pushed on, the downhill assist control function is available and the downhill assist control indicator light illuminates.
HINT: Even if the downhill assist control switch is pressed, the downhill assist control indicator light will blink and downhill assist control will not be activated under the following conditions:
- Gear position is not L or R.
- The system is malfunctioning.
- Temperature of the hydraulic brake booster increases and downhill assist control is temporarily canceled.
- The vehicle speed is 25 km/h (15 mph) or more.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if the CAN communication system DTC is output Diagnosis System.

Result





B -- REPAIR CAN COMMUNICATION SYSTEM
A -- Continue to next step.
2. CHECK SKID CONTROL ECU CONNECTOR
(a) Check if the skid control ECU connector is securely connected.
OK:
The connector is securely connected.
NG -- CONNECT CONNECTOR CORRECTLY
OK -- Continue to next step.
3. CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND)





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






OK -- CHECK COMBINATION METER
NG -- Continue to next step.
4. 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.
5. CHECK WIRE HARNESS (CONTROL SWITCH - SKID CONTROL ECU AND BODY GROUND)





(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 -- Continue to next step.
6. CHECK COMBINATION METER
(a) Check the combination meter How To Proceed With Troubleshooting.
NG -- REPLACE COMBINATION METER
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY