C1380
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1380/64: Stop Light Control Relay Malfunction
C1380/64 - Stop Light Control Relay Malfunction
DESCRIPTION
Upon receiving the hill-start assist control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.
WIRING DIAGRAM
Refer to DTC C1249/49 C1249.
INSPECTION PROCEDURE
HINT
When DTC C1249/49 is output together with DTC C1380/64, inspect and repair the trouble areas indicated by DTC C1249/49 first C1249.
PROCEDURE
1. CHECK STOP LIGHT 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:
NG -- INSPECT STOP LIGHT CIRCUIT Exterior Lighting System
OK -- Continue to next step.
2. 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 on the Techstream Data List / Active Test.
ABS/VSC/TRAC
ABS/VSC/TRAC:
(d) Check that the stop light switch condition observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
NG -- INSPECT SKID CONTROL ECU (STP TERMINAL)
OK -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL (BRK) RELAY)
(a) Select the Data List on the Techstream Data List / Active Test.
ABS/VSC/TRAC
ABS/VSC/TRAC:
(b) Select the Active Test on the Techstream Data List / Active Test.
ABS/VSC/TRAC
ABS/VSC/TRAC:
(c) Perform the Active Test of the stop light control (BRK) relay using the Techstream.
(d) Check for stop light control (BRK) relay operation using Data List and stop light operation by performing an Active Test.
Result:
B -- INSPECT STOP LIGHT CONTROL (BRK) RELAY
A -- Continue to next step.
4. INSPECT SKID CONTROL ECU (STP2 TERMINAL)
(a) Turn the ignition switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the skid control ECU connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
Text in Illustration:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Reconnect the skid control ECU connector.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Perform a road test.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
6. INSPECT STOP LIGHT CONTROL (BRK) RELAY
(a) Turn the ignition switch off.
(b) Remove the stop light control (BRK) relay.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Text in Illustration:
NG -- REPLACE STOP LIGHT CONTROL (BRK) RELAY
OK -- Continue to next step.
7. INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
Text in Illustration:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.
8. INSPECT SKID CONTROL ECU (STP0 TERMINAL)
(a) Install the stop light control (BRK) relay.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the skid control ECU connector.
(d) Turn the ignition switch to ON.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
Text in Illustration:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
9. INSPECT SKID CONTROL ECU (STP TERMINAL)
(a) Turn the ignition switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the skid control ECU connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
Text in Illustration:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal