DESCRIPTION When the
electric parking brake switch is pulled, a lock request signal is sent
from the skid control ECU (brake actuator assembly) to the parking brake
actuator assembly. When the electric parking brake switch is pushed, a
release request signal is sent from the skid control ECU (brake actuator
assembly) to the parking brake actuator assembly. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Memory | Note | |
C13B4 | EPB Switch Malfunction |
- Parking brake switch open or short circuit is detected for 1 second or more
- Parking brake switch stuck malfunction
|
- Electric parking brake switch (electric parking brake switch assembly)
- Wire harness or connector
- Skid control ECU (brake actuator assembly)
| DTC stored |
An electric parking brake system malfunction is displayed on the multi-information display. | DTC Detection Conditions | |
Vehicle Condition | |
Pattern 1 | Pattern 2 | |
Diagnosis Condition | - |
- | - | |
Malfunction Status | Parking brake switch open or short circuit is detected for 1 second or more |
○ | - | |
Parking brake switch stuck malfunction |
- | ○ | |
Detection Time | 1 second or more |
- | |
Number of Trips | 1 trip |
1 trip | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- The electric parking brake may still operate up to 20 seconds after the
engine switch is turned off. Before disconnecting connectors or fuses,
turn the engine switch off and wait 20 seconds or more.
- When replacing the skid control ECU (brake actuator assembly), operate
the electric parking brake switch (electric parking brake switch
assembly) as the parking brake indicator light (red) blinks when the
engine switch is first turned on (IG).
PROCEDURE |
1. | INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) |
(a) Remove the electric parking brake switch (electric parking brake switch assembly).
Click here  (b) Inspect the electric parking brake switch (electric parking brake switch assembly).
Click here
| NG |
 | REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) |
|
OK |
 | |
| 2. |
CHECK
HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) -
ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)) |
(a) Disconnect the G24 electric parking brake switch (electric parking brake switch assembly) connector.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A28-31 (SWI1) - G24-9 (SWI1) |
Always | Below 1 Ω | |
A28-32 (SWO1) - G24-10 (SWO1) |
Always | Below 1 Ω | |
A28-15 (SWI2) - G24-1 (SWI2) |
Always | Below 1 Ω | |
A28-16 (SWO2) - G24-2 (SWO2) |
Always | Below 1 Ω | |
A28-31 (SWI1) or G24-9 (SWI1) - Body ground |
Always | 10 kΩ or higher | |
A28-32 (SWO1) or G24-10 (SWO1) - Body ground |
Always | 10 kΩ or higher | |
A28-15 (SWI2) or G24-1 (SWI2) - Body ground |
Always | 10 kΩ or higher | |
A28-16 (SWO2) or G24-2 (SWO2) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
(a) Clear the DTCs. Chassis > ABS/VSC/TRAC/EPB > Clear DTCs
(b) Turn the engine switch off. (c) Turn the engine switch on (IG).
(d) Check for DTCs. Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
| Result |
Proceed to | | DTCs are output |
A | | DTCs are not output |
B |
| A |
| REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
| B |
| USE SIMULATION METHOD TO CHECK | | 
