Brake Hold Standby Indicator Light Circuit [03/2017 - ]: Procedure
- PRE-CHECK
- If the brake hold standby indicator light does not illuminate even though the brake hold switch is pushed, check that the brake hold function operation conditions are met.
- The driver side door is closed.
- The driver side seat belt is fastened.
- The system is normal.
HINT:
If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.
- Brake system
- Electric parking brake system
- SFI system
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 is pushed, check that the brake hold function operation conditions are met.
- CHECK CAN COMMUNICATION SYSTEM
- Check if CAN communication system DTCs are output.
Refer to DIAGNOSIS SYSTEM [03/2017 - 06/2019] , or refer to DIAGNOSIS SYSTEM [06/2019 - 04/2020] , or refer to DIAGNOSIS SYSTEM [04/2020 - 11/2021] , or refer to DIAGNOSIS SYSTEM [11/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 05/2023] , or refer to DIAGNOSIS SYSTEM [05/2023 - ]
Result
Result Proceed to DTCs are not output. A DTCs are output. B
Result:
B
INSPECT CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 05/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ]
Result:
A
See step 3
- Check if CAN communication system DTCs are output.
- PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD STANDBY INDICATOR LIGHT)
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Select the Active Test on the Techstream.
Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023] , or refer to DATA LIST / ACTIVE TEST [05/2023 - ]
Chassis > ABS/VSC/TRAC > Active Test
Tester Display Measurement Item Control Range Diagnostic Note BH Standby Light Brake hold standby indicator light Indicator light ON/OFF Observe combination meter assembly Chassis > ABS/VSC/TRAC > Active Test
Tester Display BH Standby Light - Select the Data List on the Techstream.
Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023] , or refer to DATA LIST / ACTIVE TEST [05/2023 - ]
Chassis > ABS/VSC/TRAC > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note BH Standby Light Brake hold standby indicator light ON or OFF ON: Indicator light on
OFF: Indicator light off- Chassis > ABS/VSC/TRAC > Data List
Tester Display BH Standby Light - Check the operating condition of the brake hold standby indicator light when operating it using the Techstream.
Result
Result Proceed to Brake hold standby indicator light in the Data List does not change using the Active Test. A Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test. B
Result:
A
REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL [03/2017 - 05/2023] , or refer to REMOVAL [05/2023 - ]
Result:
B
See step 4
- INSPECT COMBINATION METER ASSEMBLY
- Turn the engine switch off.
- Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.
Refer to DATA LIST / ACTIVE TEST [03/2017 - ]
Body Electrical > Combination Meter > Active Test
Tester Display Indicat. Brake Hold - Check the combination meter assembly.
OK
The brake hold standby indicator light turns on or off in accordance with the Techstream operation.
Result
Proceed to OK NG
Result:
NG
INSPECT METER / GAUGE SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ]
Result:
OK
See step 5
- INSPECT BRAKE HOLD SWITCH
- Turn the engine switch off.
*a Component without harness connected
(Brake Hold Switch) - Disconnect the P2 brake hold switch connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 (+B) - 4 (E) Switch pushed Below 1 Ω 3 (+B) - 4 (E) Switch not pushed 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPLACE BRAKE HOLD SWITCH. Refer to REMOVAL [03/2017 - ]
Result:
OK
See step 6
- Turn the engine switch off.
- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE HOLD SWITCH)
- Disconnect the A10 skid control ECU assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A10-14 (HZRI) - P2-3 (+B) Always Below 1 Ω A10-14 (HZRI) or P2-3 (+B) - Body ground Always 10 kΩ or higher P2-4 (E) - Body ground Always Below 1 Ω Result
Proceed to OK NG
Result:
NG
REPAIR BRAKE HOLD SWITCH
Result:
OK
See step 7
- INSPECT COURTESY LIGHT SWITCH
- Turn on the interior lights and check that they illuminate, and then set the switch so that the lights illuminate when the door is opened.
- Check that the lights illuminate when the driver side door is opened.
OK
The interior lights illuminate when the driver side door is opened.
Result
Proceed to OK NG
Result:
NG
INSPECT LIGHTING SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ]
Result:
OK
See step 8
- CHECK HARNESS AND CONNECTOR (CTY TERMINAL)
- Measure the voltage and waveform according to the value(s) in the table below.
*a Component with harness connected
(Skid Control ECU Assembly)Standard Voltage
Tester Connection Condition Specified Condition A8-14 (CTY) - Body ground Driver door open Below 1 V A8-14 (CTY) - Body ground Driver door closed Pulse generation (waveform 1) - Waveform 1 (Reference)
*a Driver door closed *b Driver door open Item Content Tester Connection A8-14 (CTY) - Body ground Tool Setting 5 V/DIV., 10 ms./DIV. Vehicle Condition Driver door closed → open
Result
Proceed to OK NG - Waveform 1 (Reference)
Result:
OK
REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL [03/2017 - 05/2023] , or refer to REMOVAL [05/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (CTY CIRCUIT)
- Measure the voltage and waveform according to the value(s) in the table below.