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C122B



C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE








When Monitored:

With the ignition on

Set Condition:

When the Anti-Lock Brake Module indicates that the Brake Pedal Force Switch signals are implausible.





Diagnostic Test

1. CHECK FOR A DTC C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE





NOTE: This DTC must be active for the results of this test to be valid

Turn the ignition on.
With the scan tool read and record DTC's.
With the scan tool read and record Freeze Fame information.
With the scan tool erase DTC's.

CAUTION: Ensure brake capability is available before road testing.

Test drive vehicle above 24 k/mh (15 mph)
With the scan tool read and record DTC's.

Does the scan tool display: C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION diagnostic pro cedure
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE





Check all related wiring for bruised chafed pierced or partially broken wires.
Check all related connectors for broken bent pushed out or corroded terminals.

Were any problems found?

Yes

- Repair as necessary
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 3

. CHECK THE VOLTAGE ON THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT





Turn the ignition on.
Back probe the (B134) Brake Pedal Force Switch Close circuit at the Active Brake Booster harness connector.
Measure the voltage of the (B134) Brake Pedal Force Switch Close circuit.

Is the voltage approximately 6 volts?

Yes

- Go To 7

No

- Go To 4

4. CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Turn the ignition on.
Using a l2wolt test light connected to ground check the (B134) Brake Pedal Force Switch Close circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B134) Brake Pedal Force Switch Close circuit for a short to voltage.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 5

5. CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Using a 12-volt test light connected to 12 volts check the (B134) Brake Pedal Force Switch Close circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B134) Brake Pedal Force Switch Close circuit for a short to ground.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 6

6. CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR AN OPEN





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Connect a jumper wire between the (B134) Brake Pedal Force Switch Close circuit and ground.
Using a 12-volt test light connected to 12-volts check the (B134) Brake Pedal Force Switch Close circuit.

Does the test light illuminate brightly?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Repair the (B134) Brake Pedal Force Switch Close circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

7. CHECK THE VOLTAGE ON THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT





Turn the ignition on.
Back probe the (B135) Brake Pedal Force Switch Open circuit at the Active Brake Booster harness connector.
Measure the voltage of the (B135) Brake Pedal Force Switch Open circuit.

Is the voltage approximately 12 volts?

Yes

- Go To 11

No

- Go To 8

8. CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Using a l2wolt test light connected to ground, check the (B135) Brake Pedal Force Switch Open circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B135) Brake Pedal Force Switch Open circuit for a short to voltage.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 9

9. CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Using a 12-volt test light connected to 12 volts, check the (B135) Brake Pedal Force Switch Open circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B135) Brake Pedal Force Switch Open circuit for a short to ground.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 10

10. CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR AN OPEN





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Connect a jumper wire between the (B135) Brake Pedal Force Switch Open circuit and ground.
Using a 12-volt test light connected to 12-volts check the (B135) Brake Pedal Force Switch Open circuit.

Does the test light illuminate brightly?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Repair the (B135) Brake Pedal Force Switch Open circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

11. CHECK THE VOLTAGE ON THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT





Turn the ignition on.
Back probe the (B136) Brake Pedal Force Switch Signal circuit at the Active Brake Booster harness connector.
Measure the voltage of the (B136) Brake Pedal Force Switch Signal circuit.

- Is the voltage approximately 6 volts?

Yes

- Go To 15

No

- Go To 12

12. CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Using a 12-volt test light connected to ground, check the (B136) Brake Pedal Force Switch Signal circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B136) Brake Pedal Force Switch Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 13

13. CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Using a 12-volt test light connected to 12 volts, check the (B136) Brake Pedal Force Switch Signal circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B136) Brake Pedal Force Switch Signal circuit for a short to ground.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 14

14. CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR AN OPEN





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Active Brake Booster harness connector.
Connect a jumper wire between the (B136) Brake Pedal Force Switch Signal circuit and ground.
Using a 12-volt test light connected to 12-volts check the (B136) Brake Pedal Force Switch Signal circuit.

Does the test light illuminate brightly?

Yes

- Replace the Anti-Lock Brake Module .
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Repair the (B136) Brake Pedal Force Switch Signal circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

15. CHECK THE VOLTAGE ON THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT





Turn the ignition on.
Back probe the (B134) Brake Pedal Force Switch Close circuit at the Active Brake Booster harness connector.
Depress and hold the brake pedal.
Measure the voltage of the (B134) Brake Pedal Force Switch Close circuit.

Is the voltage approximately 12 volts?

Yes

- Go To 16

No

- Replace the Brake Pedal Force Switch .
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

16. CHECK THE VOLTAGE ON THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT





Turn the ignition on.
Back probe the (B135) Brake Pedal Force Switch Open circuit at the
Active Brake Booster harness connector.
Depress and hold the brake pedal.
Measure the voltage of the (B135) Brake Pedal Force Switch Open circuit.

Is the voltage approximately 6 volts?

Yes

- Go To 17

No

- Replace the Brake Pedal Force Switch.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

17. CHECK THE VOLTAGE ON THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT





Turn the ignition on.
Back probe the (B136) Brake Pedal Force Switch Signal circuit at the Active Brake Booster harness connector.
Depress and hold the brake pedal.
Measure the voltage of the (B136) Brake Pedal Force Switch Signal circuit.

Is the voltage approximately 6 volts?

Yes

- Replace the Anti~Lock Brake Module.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Replace the Brake Pedal Force Switch.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.
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