| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AWHZ |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - 08/2021] |
| Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): C13B4; EPB Switch Malfunction; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
|
DTC |
C13B4 |
EPB Switch Malfunction |
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 |
|
|
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
![2019 - 2022 MY Avalon Avalon HV [04/2018 - ]; PARKING BRAKE: ELECTRIC PARKING BRAKE SWITCH: REMOVAL](/t3Portal/stylegraphics/info.gif)
(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) |
|
|
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 |
|
|
3. |
CHECK DTC |
(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 |
|
|
|