C1380

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

DTC C1380/64 - Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the dynamic radar cruise control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.






(*1): with dynamic radar cruise control

WIRING DIAGRAM









INSPECTION PROCEDURE
NOTE:
When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.
HINT: When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first.

PROCEDURE

1. INSPECT STOP FUSE




(a) Remove the STOP fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE STOP FUSE
OK -- Continue to next step.
2. CHECK STOP LIGHT OPERATION
(a) Install the STOP fuse.
(b) Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
OK:






NG -- INSPECT STOP LIGHT CIRCUIT
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU (STP1 TERMINAL)




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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (STP2 TERMINAL)




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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)
OK -- Continue to next step.
5. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL RELAY)
(a) Reconnect the skid control ECU connector.
(b) Connect Techstream to the DLC3.
(c) Start the engine.
(d) Select the Active Test mode on Techstream.

ABS / VSC / TRAC:





(e) Check that the "ON" and "OFF" of the stop light can be shown on the rear combination light by Techstream.
OK:
The stop light turns on or off in accordance with Techstream.
OK -- RECONFIRM DTC
NG -- Continue to next step.
6. INSPECT STOP LIGHT CONTROL RELAY




(a) Turn the engine switch off.
(b) Remove the stop light control relay.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE STOP LIGHT CONTROL 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:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.
8. INSPECT SKID CONTROL ECU (STPO TERMINAL)




(a) Turn the engine switch off.
(b) Install the stop light control relay.
(c) Disconnect the skid control ECU connector.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)
OK -- Continue to next step.
9. RECONFIRM DTC
(a) Turn the engine switch off.
(b) Reconnect the skid control ECU connector.
(c) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(d) Perform a road test Road Test.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)