Brake Hold Standby Indicator Light Circuit [03/2024 - ]: Procedure
- PRE-CHECK
- If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
Result
Proceed to NEXT
Result:
NEXT
See step 2
- If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.
- READ VALUE USING GTS (BRAKE HOLD READY)
- All of the following brake hold operation conditions are met:
- The driver door is closed.
- The driver seat belt is fastened.
- Check the brake hold standby indicator light and mode condition on the GTS changes according to brake hold switch (electric parking brake switch assembly) operation.
Chassis > Brake/EPB > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Brake Hold Ready Brake hold control permission status Not in stand-by mode / Stand-by mode Not in stand-by mode: Brake hold function not operating (brake hold standby indicator not illuminated)
Stand-by mode: Brake hold function stand-by state (brake hold standby indicator illuminated)- Chassis > Brake/EPB > Data List
Tester Display Brake Hold Ready Standard
Brake Hold Switch (Electric Parking Brake Switch Assembly) Operation Mode Condition Display Brake Hold Standby Indicator Light Not pressed Not in stand-by mode Does not come on Pressing the brake hold switch (electric parking brake switch assembly) Stand-by mode come on Result
Result Proceed to Indicator light and mode condition display do not change A Mode condition display is normal, but indicator light does not change B Indicator light and mode condition display are normal C
Result:
B
INSPECT METER / GAUGE SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]
Result:
C
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]
Result:
A
See step 3
- All of the following brake hold operation conditions are met:
- INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY
Refer to INSPECTION [03/2024 - ]
OK
The brake hold switch (electric parking brake switch assembly) is normal.
Result
Proceed to OK NG Result:
NG
REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
OK
See step 4
- CHECK HARNESS AND CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK
The connector is securely connected.
- Disconnect the A36 skid control ECU (brake actuator assembly) connector.
- Disconnect the D161 brake hold switch (electric parking brake switch assembly) connector.
- Check both the connector case and the terminal for deformation and corrosion.
OK
No deformation or corrosion.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D161-3 (+B) - A36-42 (HZRI) Always Below 1 Ω D161-3 (+B) or A36-42 (HZRI) - Body ground Always 10 kΩ or higher D161-7 (E) - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Make sure that there is no looseness at the locking part and the connecting part of the connector.