Lexus ES: Electric Parking Brake Switch Signal Compare Failure (C060962)
DESCRIPTION
When the electric parking brake switch is pushed, 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 pulled, 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 |
|---|---|---|---|---|---|
| C060962 | Electric Parking Brake Switch Signal Compare Failure |
|
| DTC stored | An electric parking brake system malfunction is displayed on the multi-information display. |
| Vehicle Condition | ||||
|---|---|---|---|---|
| Pattern 1 | Pattern 2 | Pattern 3 | ||
| Diagnosis Condition | - | - | - | - |
| Malfunction Status | Parking brake switch open circuit is detected | ○ | - | - |
| Parking brake switch short circuit is detected | - | ○ | - | |
| Parking brake switch stuck malfunction | - | - | ○ | |
| Detection Time | 1 second or more | 1 second or more | - | |
| Number of Trips | 1 trip | 1 trip | 1 trip | |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the electric parking brake switch is held near the lock position but not fully in the lock position for 1 second or more, a DTC may be stored due to one of the two contacts being ON while the other is OFF. (This is not a system malfunction.)
- 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.
-
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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- When replacing the skid control ECU (brake actuator assembly), operate the 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 ASSEMBLY |
(a) Remove the electric parking brake switch assembly.
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(b) Inspect the electric parking brake switch assembly.
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| NG | .gif) | REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
|
| 2. | CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) |
(a) Disconnect the G29 electric parking brake switch assembly connector.
(b) Disconnect the A40 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 |
|---|---|---|
| A40-31 (SWI1) - G29-7 (SWI1) | Always | Below 1 Ω |
| A40-32 (SWO1) - G29-8 (SWO1) | Always | Below 1 Ω |
| A40-15 (SWI2) - G29-1 (SWI2) | Always | Below 1 Ω |
| A40-16 (SWO2) - G29-2 (SWO2) | Always | Below 1 Ω |
| A40-31 (SWI1) or G29-7 (SWI1) - Body ground | Always | 10 kΩ or higher |
| A40-32 (SWO1) or G29-8 (SWO1) - Body ground | Always | 10 kΩ or higher |
| A40-15 (SWI2) or G29-1 (SWI2) - Body ground | Always | 10 kΩ or higher |
| A40-16 (SWO2) or G29-2 (SWO2) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CLEAR DTC |
(a) Clear the DTCs.
Chassis > Brake/EPB > Clear DTCs(b) Turn the engine switch off.
|
| 4. | CHECK DTC |
(a) Check for DTCs.
Chassis > Brake/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 |
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