DTC P0504
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0504: Brake Switch “A” / “B” Correlation Any of the following conditions is met.
•Brake light switch signal does not correlate with brake switch signal. (1 D/C detection logic or 3 D/C detection logic but MIL does not light up)•Brake signal does not change for specified time. |
•Brake light switch / brake switch and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B2: | Brake light switch signal circuit | 4. | “CRUISE” fuse |
| A1: | Brake switch power supply circuit | 1. | Brake light switch / brake switch | 5. | “STOP” fuse |
| A2: | Brake light switch power supply circuit | 2. | Brake light | 6. | To other control modules |
| B1: | Brake switch signal circuit | 3. | ECM |
DTC Confirmation Procedure
1)Run engine at idle speed.
2)Depress and release brake pedal 20 times.
3)When depressing or releasing brake pedal, check indication on “Brake Switch” in “Data List” mode on SUZUKI scan tool.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Brake light switch power supply circuit and brake switch power supply circuit check
1)With ignition “OFF”, disconnect brake light switch / brake switch connector.
2)Check for proper terminal connection to brake light switch / brake switch connector.
3)If connection is OK, set ignition “ON”.
4)Check that voltage between each of “A1” and “A2” circuits and ground is battery voltage.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
Brake light switch signal circuit and brake switch signal circuit check
1)With ignition “OFF”, disconnect “C01” and “E01” connectors from ECM.
2)Check for proper terminal connection to “C01” and “E01” connectors.
3)If connections are OK, check the following points.
•Resistance of “B1” and “B2” circuits: less than 1 Ω
•Resistance between each of “B1” and “B2” circuits and ground: infinity •Resistance between “B1” 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 “B1” 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 check
1)Check brake light switch / brake switch.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace brake light switch / brake switch.
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