C13A2

PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM: C13A2/22: Engine / Power Switch Malfunction
C13A2/22 - Engine / Power Switch Malfunction

DESCRIPTION

When the engine switch is turned on (IG), the IG operation power supply is output from the main body ECU. Power is then supplied from the luggage room junction block's RR-IG1 relay, which turns the RR-IG1 relay ON. Power is then supplied to the parking brake ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- If the electric parking brake ECU or electric parking brake actuator is replaced, perform the "Reset Memory" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Programming and Relearning.
- Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.

PROCEDURE

1. CHECK IG VOLTAGE (DATA LIST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(e) Check the values by referring to the table below.

Electric Parking Brake





OK:

On the Techstream screen, item changes between ON and OFF according to switch operation.

NG -- INSPECT FUSE (RR-IG1-1, D-IG1-3)
OK -- Continue to next step.

2. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTC.

Result:





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE ELECTRIC PARKING BRAKE ECU Removal

3. INSPECT FUSE (RR-IG1-1, D-IG1-3)

(a) Remove the RR-IG1-1 fuse from the luggage room junction block.

(b) Remove the D-IG1-3 fuse from the main body ECU.

(c) Measure the resistance of the fuse.

Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (ECU - LUGGAGE ROOM JUNCTION BLOCK AND BODY GROUND)





(a) Disconnect the S46 and S48 ECU connectors.

(b) Disconnect the LA luggage room junction block connector.

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

Standard resistance:





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

5. CHECK LUGGAGE ROOM JUNCTION BLOCK (RR-IG1 RELAY)

(a) Disconnect the S48 ECU connector.

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





Standard voltage:





Result





B -- REPLACE ELECTRIC PARKING BRAKE ECU Removal
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - BATTERY)

(a) Disconnect the LG luggage room junction block connector.

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





Standard voltage:





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

7. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - BATTERY)

(a) Disconnect the LD luggage room junction block connector.

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





Standard voltage:





Result





B -- REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY
A -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - MAIN BODY ECU)





(a) Disconnect the LD luggage room junction block connector.

(b) Disconnect the DD main body ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (Power Source Mode does not Change) Power Source Mode does not Change