C1249

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1249/49: Open in Stop Light Switch Circuit

DTC C1249/49 - Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU detects the brake operating conditions through a signal transmitted by the stop light switch. The skid control ECU incorporates an open circuit detection circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the VSC actuator assembly, perform zero point calibration (Programming and Relearning).

PROCEDURE

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





OK:
ON (brake pedal is depressed) appears on the screen.
NG -- INSPECT FUSE (STOP)
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTC (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTC is output (Reading and Clearing Diagnostic Trouble Codes).

Result





B -- USE SIMULATION METHOD TO CHECK
A -- REPLACE VSC ACTUATOR ASSEMBLY
3. INSPECT FUSE (STOP)





(a) Remove the STOP fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
4. INSPECT STOP LIGHT CONTROL RELAY (BRK NO. 1, BRK NO. 2)





(a) Remove the stop light control relays (BRK NO. 1 and BRK NO. 2) from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for BRK NO. 1
for BRK NO. 2









NG -- REPLACE STOP LIGHT CONTROL RELAY
OK -- Continue to next step.
5. INSPECT STOP LIGHT SWITCH ASSEMBLY





(a) Disconnect the A4 switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU)





(a) Disconnect the A17 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE VSC ACTUATOR ASSEMBLY