DTC P0504
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0504: Brake Switch “A” / “B” Correlation Brake light switch signal is inconsistent with brake switch signal. (1 D/C detection logic) |
•Brake light switch / brake switch and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | Brake light switch power supply circuit | 2. | Brake switch |
| A1: | Brake switch power supply circuit | B2: | Brake light switch signal circuit | 3. | Brake light switch |
| A2: | Brake switch signal circuit | 1. | ECM | 4. | Brake light |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Brake switch power supply circuit and brake light switch power supply circuit check
1)When ignition is “OFF”, disconnect brake light switch / brake switch connector.
2)Check for proper terminal connection to brake light switch / brake switch connector.
3)If connections are OK, set ignition “ON”.
4)Check that voltage between each of “A1” and “B1” circuits and ground is battery voltage.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
Brake switch signal circuit and brake light switch signal circuit check
1)When ignition is “OFF”, disconnect “E01” connector from ECM.
2)Check for proper terminal connection to “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A2” and “B2” circuits: less than 1 Ω
•Resistance between each of “A2” and “B2” circuits and ground: infinity •Resistance between “A2” circuit terminal and other terminal at brake light switch / brake switch connector: infinity •Resistance between “B2” circuit terminal and other terminal at brake light switch / brake switch connector: infinity •Voltage of “A2” and “B2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 4.
|
Repair or replace defective wire harness.
|
| 4 |
Brake light switch and brake switch check
1)Check brake light switch / brake switch.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace brake light switch / brake switch.
|