Skid Control Buzzer Circuit

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for BOSCH Made): Skid Control Buzzer Circuit

Skid Control Buzzer Circuit

DESCRIPTION

The skid control buzzer sounds and the SLIP indicator light blinks during VSC operation.

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER)
(a) Connect Techstream to the DLC3.
(b) Select the "Active Test" on Techstream Data List / Active Test.

Active Test: ABS / VSC / TRAC





(c) Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using Techstream.
Result:






B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
A -- Continue to next step.
2. INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)




(a) Disconnect the skid control buzzer connector.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.
3. INSPECT SKID CONTROL BUZZER




(a) Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.
OK:
The skid control buzzer sounds.
NG -- REPLACE SKID CONTROL BUZZER
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO SKID CONTROL BUZZER)




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





(c) Connect the connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU TO SKID CONTROL BUZZER)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY