Sierra 3500 4WD V8-6.0L (2008)
Adjustable Pedal Switch Circuit Test
1. Disconnect the adjustable pedal switch connector and verify that neither of the adjuster switch inputs are displayed as Active.
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If either of the switch inputs are displayed as Active, test the affected switch signal circuit for a short to voltage. If the circuit tests normal
replace the MSM.
2. Verify that battery voltage is present at the reference voltage circuit terminal 5.
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If battery voltage is not present, test the reference voltage circuit for an open/high resistance. If the circuit tests normal replace the MSM.
3. Connect a fused jumper wire from the reference voltage circuit terminal 5 to each of the switch signal circuit terminals 4 and 6, and verify that the
switch inputs are displayed as Active when connected.
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If the switch inputs are not Active with the jumper wire connected, test the affected switch signal circuit for an open/high resistance. If the
circuit tests normal replace the MSM.
4. If the circuits test normal replace the adjustable pedal switch.
Motor Control Circuit Test
1. Disconnect the MSM connector C3.
2. Verify that a test lamp illuminates when connected from the high current battery supply circuit terminal 5 to ground.
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If the test lamp does not illuminate, repair the high current battery supply circuit for an open or short to ground.
3. Connect the MSM connector C3 and disconnect the adjustable pedal motor connector.
4. Ignition on, verify that approximately 2 volts are present at the motor control circuit terminals.
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If 2 volts are not present, repair the affected motor control circuit for an open/high resistance. If the circuits test normal replace the MSM.
5. If the circuits test normal replace the brake pedal assembly.
Repair Instructions
Perform the after completing the diagnostic procedure.
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Accessory Switch Replacement (with RPO SLT) Accessory Switch Replacement (without RPO SLT)
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Brake Pedal Assembly Replacement
