Stop Light Control Relay Malfunction - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1380/64: Stop Light Control Relay Malfunction

DTC C1380/64 - Stop Light Control Relay Malfunction

DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects the status of the brake operation.

WIRING DIAGRAM

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

PROCEDURE

1. CHECK STOP LIGHT SWITCH OPERATION
(a) Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.
OK:

HINT: Check the stop light bulbs as they may have burnt out.

NG -- CHECK STOP LIGHT SWITCH CIRCUIT
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP)

(a) Disconnect the skid control ECU connector.
(b) Measure the voltage.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP2)

(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the resistance.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)
OK -- Continue to next step.
4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Select the following menu items: Chassis / ABS/VSC/TRAC/ Active Test
Select the "Stop Light Relay" in the Active Test and operate the stop light relay using the Techstream.

ACTIVE TEST: ABS/VSC/TRAC

(e) Check that the stop lights turn on and off on the rear combination light when using the Techstream.
OK:
The stop lights turn on and off according to the Techstream operations.
NG -- CHECK STOP LP CTRL RELAY
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:

B -- END
A -- REPLACE MASTER CYLINDER SOLENOID
6. CHECK STOP LP CTRL RELAY

(a) Disconnect the STOP LP CTRL relay.
(b) Turn the ignition switch to ON.
(c) Measure the voltage.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT STOP CTRL LP RELAY

(a) Remove the STOP LP CTRL relay from the engine room R/B No. 2.
(b) Measure the resistance.
Standard resistance:

NG -- REPLACE STOP LP CTRL RELAY
OK -- Continue to next step.
8. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STPO)

(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)
OK -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:

B -- END
A -- REPLACE MASTER CYLINDER SOLENOID