Operation CHARM: Car repair manuals for everyone.
Home >> Toyota >> 2012 >> Tacoma PreRunner V6-4.0L (1GR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> C Code Charts >> C1380 >> Vehicle Stability Control System (for Hydraulic Brake Booster)

Vehicle Stability Control System (for Hydraulic Brake Booster)





BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): C1380: Stop Light Control Relay Malfunction
C1380 - Stop Light Control Relay Malfunction

DESCRIPTION

The skid control ECU (master cylinder solenoid) inputs the stop light switch signal and detects the status of the brake operation.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When replacing the skid control ECU (master cylinder solenoid), perform zero point calibration Vehicle Stability Control System (for Hydraulic Brake Booster).
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
When DTC C1425 is output together with DTC C1380, inspect and repair the trouble areas indicated by DTC C1425 first Vehicle Stability Control System (for Hydraulic Brake Booster).

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:

Stop light switch function is normal.

NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Disconnect the skid control ECU (master cylinder solenoid) connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)

(a) Disconnect the skid control ECU (master cylinder solenoid) connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)
OK -- Continue to next step.

4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

ABS/VSC/TRAC





(f) 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 HARNESS AND CONNECTOR (STOP LP CTRL RELAY TERMINAL)
OK -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTCs Vehicle Stability Control System (for Hydraulic Brake Booster).

(b) Turn the ignition switch off.

(c) Check if the same DTC is output Vehicle Stability Control System (for Hydraulic Brake Booster).

Result





B -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

A -- REPLACE MASTER CYLINDER SOLENOID Disassembly

6. CHECK HARNESS AND CONNECTOR (STOP LP CTRL RELAY TERMINAL)

(a) Remove the STOP LP CTRL relay from the engine room relay block.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LP CTRL RELAY CIRCUIT)
OK -- Continue to next step.

7. INSPECT STOP LP CTRL RELAY

(a) Remove the STOP LP CTRL relay from the engine room relay block.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE STOP LP CTRL RELAY
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (STPO TERMINAL)

(a) Disconnect the skid control ECU (master cylinder solenoid) connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)
OK -- Continue to next step.

9. RECONFIRM DTC

(a) Clear the DTCs Vehicle Stability Control System (for Hydraulic Brake Booster).

(b) Turn the ignition switch off.

(c) Check if the same DTC is output Vehicle Stability Control System (for Hydraulic Brake Booster).

Result





B -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

A -- REPLACE MASTER CYLINDER SOLENOID Disassembly

10. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Disconnect the stop light switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.

11. INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Disconnect the stop light switch assembly connector.

(b) Measure the resistance according the value(s) in the table below.





Standard Resistance:





Text in Illustration





(c) Reconnect the stop light switch assembly connector.

NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - STOP LP CTRL RELAY)

(a) Remove the STOP LP CTRL relay from the engine room relay block.

(b) Measure the resistance according the value(s) in the table below.

Standard Resistance:





(c) Reinstall the STOP LP CTRL relay from the engine room relay block.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

13. INSPECT STOP LP CTRL RELAY

(a) Remove the STOP LP CTRL relay from the engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- REPLACE STOP LP CTRL RELAY
OK -- Continue to next step.

14. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY, HIGH MOUNTED STOP LIGHT ASSEMBLY - STOP LP CTRL RELAY)

(a) Disconnect the rear combination light assembly connector.

(b) Disconnect the high mounted stop light assembly connector.

(c) Remove the STOP LP CTRL relay.

(d) Measure the resistance according the value(s) in the table below.

Standard Resistance:

Rear Combination Light Assembly RH





Standard Resistance:

Rear Combination Light Assembly LH





Standard Resistance:

High Mounted Stop Light Assembly





(e) Reinstall the STOP LP CTRL relay.

(f) Reconnect the rear combination light assembly connector.

(g) Reconnect the high mounted stop light assembly connector.

Result





B -- INSPECT REAR COMBINATION LIGHT ASSEMBLY

C -- INSPECT CENTER STOP LIGHT BULB

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR

15. INSPECT REAR COMBINATION LIGHT ASSEMBLY

(a) Remove the rear combination light assembly connector.

(b) Apply battery voltage to the terminals and check that the rear combination light illuminates.





OK





Text in Illustration





(c) Reinstall the rear combination light assembly.

NG -- REPLACE REAR COMBINATION LIGHT ASSEMBLY

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

16. INSPECT CENTER STOP LIGHT BULB

(a) Remove the high mounted stop light assembly connector.

(b) Apply battery voltage to the terminals and check that the rear combination light illuminates.





OK





Text in Illustration





(c) Reinstall the high mounted stop light assembly.

NG -- REPLACE CENTER STOP LIGHT BULB

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
pro multis · About Operation CHARM