DTC P0504-2B: Brake Switch "A"/"B" Signal Cross Coupled [09/2022 - ]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
- Disconnect the stop light switch assembly connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A53-7 (B) - Body ground Always 11 to 14 V - Reconnect the stop light switch assembly connector.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
- Disconnect the stop light switch assembly connector.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A53-6 (B) - Body ground Ignition switch ON 11 to 14 V - Turn the ignition switch off.
- Reconnect the stop light switch assembly connector.
Result
Proceed to OK NG
Result:
NG
See step 6
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)
- Disconnect the stop light switch assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A53-2 (GND) - Body ground Always Below 1 Ω - Reconnect the stop light switch assembly connector.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 4
- CHECK TERMINAL VOLTAGE (STP AND ST1- VOLTAGE)
- Disconnect the hybrid vehicle control ECU connector.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
*a Brake Pedal Depressed *b Brake Pedal Released *c Front view of wire harness connector
(to Hybrid Vehicle Control ECU)- - Standard Voltage
Tester Connection Brake Pedal Operation Specified Condition A161-7 (ST1-) - Body ground Released 7.5 to 14 V Depressed Below 1.5 V A161-22 (STP) - Body ground Released Below 1.5 V Depressed 7.5 to 14 V - Turn the ignition switch off.
- Reconnect the hybrid vehicle control ECU connector.
Result
Proceed to OK NG
Result:
OK
REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [09/2022 - ]
Result:
NG
See step 5
- CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
- Disconnect the stop light switch assembly connector.
- Disconnect the hybrid vehicle control ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A161-7 (ST1-) - A53-5 (L) Always Below 1 Ω A161-22 (STP) - A53-3 (L) Always Below 1 Ω A161-7 (ST1-) or A53-5 (L) - Body ground and other terminals Always 10 kΩ or higher A161-22 (STP) or A53-3 (L) - Body ground and other terminals Always 10 kΩ or higher - Reconnect the hybrid vehicle control ECU connector.
- Reconnect the stop light switch assembly connector.
Result
Proceed to OK NG
Result:
OK
REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to REMOVAL [06/2018 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - STOP LIGHT SWITCH ASSEMBLY)
- Remove the IGP-MAIN relay from the No. 1 engine room relay block and No. 1 junction block assembly.
- Disconnect the stop light switch assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 (IGP-MAIN relay holder) - A53-6 (B) Always Below 1 Ω 3 (IGP-MAIN relay holder) or A53-6 (B) - Body ground and other terminals Always 10 kΩ or higher - Reconnect the stop light switch assembly connector.
- Install the IGP-MAIN relay.
Result
Proceed to OK NG
Result:
OK
CHECK ECU POWER SOURCE CIRCUIT. Refer to ECU Power Source Circuit [09/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR