Downhill Assist Control Indicator Light Does Not Come On

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: Downhill Assist Control Indicator Light does not Come ON

Downhill Assist Control Indicator Light does not Come ON

DESCRIPTION

The downhill assist control indicator light comes on when the downhill assist control is ready.
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:
- The transfer indicator switch is in the H4 position.
- ABS system is malfunctioning.
- Temperature of the hydraulic brake booster increases and downhill assist control is temporarily canceled.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration Calibration.

PROCEDURE

1. INSPECT DOWNHILL ASSIST CONTROL INDICATOR LIGHT
(a) Disconnect the skid control ECU connector.
(b) Ground terminal HDCW of the skid control ECU.
(c) Turn the ignition switch to the ON position.
(d) Check that the downhill assist control indicator light comes on.
OK:
Downhill assist control indicator light comes on.
OK -- REPLACE MASTER CYLINDER SOLENOID
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)





(a) Disconnect the combination meter connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HDCW CIRCUIT)
OK -- Continue to next step.
3. INSPECT COMBINATION METER ASSEMBLY
(a) Check the combination meter system Meter / Gauge System.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (HDCS TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






OK -- REPLACE MASTER CYLINDER SOLENOID
NG -- Continue to next step.
5. INSPECT DOWNHILL ASSIST CONTROL SWITCH





(a) Disconnect the downhill assist control switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE DOWNHILL ASSIST CONTROL SWITCH
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DOWNHILL ASSIST CONTROL SWITCH)





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HDCS CIRCUIT)
OK -- END