Engine / Power Switch Malfunction - Electric Parking Brake System
PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM: C13A2/22: Engine / Power Switch Malfunction
C13A2/22 - Engine / Power Switch Malfunction
DESCRIPTION
When the power 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 electric 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.
* Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.
PROCEDURE
1. CHECK IG VOLTAGE (DATA LIST)
(a) Turn the power switch OFF.
(b) Connect the Techstream to the DLC3.
(c) Turn the power 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 tester 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 according to the value(s) in the table below.
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:
NG -- CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - AUXILIARY BATTERY)
OK -- REPLACE ELECTRIC PARKING BRAKE ECU Removal
6. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - AUXILIARY 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 - AUXILIARY 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:
NG -- CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - MAIN BODY ECU)
OK -- REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY
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