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Home >> Chrysler >> 2005 >> Crossfire SRT-6 V6-3.2L SC VIN N >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Antilock Brake System (ABS) >> 1201

Antilock Brake System (ABS): 1201

1201-BAS RELEASE SWITCH CIRCUIT





When Monitored and Set Condition
^ When Monitored: ignition on.
^ Set Condition: The Controller Antilock Brake (CAB) detects a Brake Assist System (BAS) Release Switch malfunction.

POSSIBLE CAUSES
- BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO VOLTAGE
- BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO GROUND
- BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO 12 VOLT SUPPLY CIRCUIT
- BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT OPEN
- BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT SHORT TO VOLTAGE
- BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT SHORT TO ANOTHER CIRCUIT
- BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT OPEN
- BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT SHORT TO GROUND
- BAS RELEASE SWITCH 12 VOLT SUPPLY CIRCUIT OPEN
- BAS RELEASE SWITCH 12 VOLT SUPPLY CIRCUIT SHORT TO GROUND
- BAS RELEASE SWITCH
- CONTROLLER ANTILOCK BRAKE (CAB)

For a complete Antilock Brake System (ABS) Circuit Diagram, (Refer to - BRAKES/ELECTRICAL - SCHEMATICS AND DIAGRAMS).

Diagnostic Test
1. MEASURE THE VOLTAGE OF THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT





Turn the ignition off. Disconnect the BAS Brake Booster C2 harness connector.

Note: Check connectors - Clean/repair as necessary.

Turn the ignition on. Measure the voltage of the BAS Release Switch Sensor (Applied) circuit at the BAS Brake Booster C2 harness connector.
Is the voltage below 1.0 volt?
Yes >> Go to 4
No >> Go to 2

2. MEASURE THE VOLTAGE OF THE SENSOR (APPLIED) CIRCUIT





Turn the ignition off.
Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the BAS Release Switch Sensor (Applied) circuit at the BAS Brake Booster C2 harness connector.
Is the voltage below 1.0 volt?
Yes >> Go to 3
No >> Repair the BAS Release Switch Sensor (Applied) circuit for a short to voltage. Perform ABS VERIFICATION TEST. ABS Verification Test

3. MEASURE THE RESISTANCE BETWEEN THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT AND ALL OTHER CAB VOLTAGE CIRCUITS





Turn the ignition off.
Measure the resistance between the BAS Release Switch Sensor (Applied) circuit and the Sensor (Released) circuit in the BAS Brake Booster C2 harness connector.
Measure the resistance between the BAS Release Switch Sensor (Applied) circuit and all 5 and 12 volt circuits in the CAB harness connector.
Is the resistance for all measurements above 100k ohms?
Yes >> Replace the Controller Antilock Brake (CAB) Module. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Repair the BAS Release Switch Sensor (Applied) circuit for a short to the circuit(s) that measured less than 100k ohms. Perform ABS VERIFICATION TEST. ABS Verification Test

4. MEASURE THE VOLTAGE OF THE BAS RELEASE SWITCH 12 VOLT SUPPLY CIRCUIT





With the ignition on. Measure the voltage of the BAS Release Switch 12 Volt Supply circuit at the BAS Brake Booster C2 harness connector.
Is the voltage above 10 volts?
Yes >> Go to 5
No >> Go to 6

5. MEASURE THE VOLTAGE OF THE BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT





With the ignition on. Measure the voltage of the BAS Release Switch Sensor (Released) circuit at the BAS Brake Booster C2 harness connector.
Is the voltage above 10 volts?
Yes >> Go to 10
No >> Go to 8

6. MEASURE THE RESISTANCE BETWEEN GROUND AND THE 12 VOLT SUPPLY CIRCUIT





Turn the ignition off.
Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the BAS Release Switch 12 Volt Supply circuit at the BAS Brake Booster C2 harness connector.
Is the resistance above 100k ohms?
Yes >> Go to 7
No >> Repair the BAS Release Switch 12 Volt Supply circuit for a short to ground. Perform ABS VERIFICATION TEST. ABS Verification Test

7. MEASURE THE RESISTANCE OF THE 12 VOLT SUPPLY CIRCUIT





With the ignition off.
Measure the resistance of the BAS Release Switch 12 Volt Supply circuit from the BAS Brake Booster C2 harness connector to the CAB harness connector.
Is the resistance below 5.0 ohms?
Yes >> Replace the Controller Antilock Brake (CAB) Module. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Repair the BAS Release Switch 12 Volt Supply circuit for an open. Perform ABS VERIFICATION TEST. ABS Verification Test

8. MEASURE THE RESISTANCE BETWEEN GROUND AND THE BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT





Turn the ignition off. Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the BAS Release Switch Sensor (Released) circuit at the BAS Brake Booster C2 harness connector.
Is the resistance above 100k ohms?
Yes >> Go to 9
No >> Repair the BAS Release Switch Sensor (Released) circuit for a short to ground. Perform ABS VERIFICATION TEST. ABS Verification Test

9. MEASURE THE RESISTANCE OF THE BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT





With the ignition off.
Measure the resistance of the BAS Release Switch Sensor (Released) circuit from the BAS Brake Booster C2 harness connector to the CAB harness connector.
Is the resistance below 5.0 ohms?
Yes >> Replace the Controller Antilock Brake (CAB) Module. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Repair the BAS Release Switch Sensor (Released) circuit for an open. Perform ABS VERIFICATION TEST. ABS Verification Test

10. MEASURE THE RESISTANCE BETWEEN GROUND AND THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT





Turn the ignition off. Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the BAS Release Switch Sensor (Applied) circuit at the BAS Brake Booster C2 harness connector.
Is the resistance above 100k ohms?
Yes >> Go to 11
No >> Repair the BAS Release Switch Sensor (Applied) circuit for a short to ground. Perform ABS VERIFICATION TEST. ABS Verification Test

11. MEASURE THE RESISTANCE OF THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT





With the ignition off. Measure the resistance of the BAS Release Switch Sensor (Applied) circuit from the BAS Brake Booster C2 harness connector to the CAB harness connector.
Is the resistance below 5.0 ohms?
Yes >> Go to 12
No >> Repair the BAS Release Switch Sensor (Applied) circuit for an open. Perform ABS VERIFICATION TEST. ABS Verification Test

12. MEASURE THE RESISTANCE BETWEEN GROUND AND THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT WITH CAB CONNECTED





With the ignition off.
Reconnect the CAB harness connector.
Measure the resistance between ground and the BAS Release Switch Sensor (Applied) circuit at the BAS Brake Booster C2 harness connector.
Is the resistance 6.5 - 7.0k ohms?
Yes >> Replace the BAS Release Switch (Brake Booster). Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Replace the Controller Antilock Brake (CAB) Module. Perform ABS VERIFICATION TEST. ABS Verification Test
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