Symptom:
P0572-BRAKE SWITCH #1 CIRCUIT LOW
When Monitored and Set Condition:
P0572-BRAKE SWITCH #1 CIRCUIT LOW
When Monitored: Ignition on.
Set Condition: When the PCM recognizes Brake Switch is mechanically stuck in the
low/on position. One Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
BRAKE LAMP SWITCH OPERATION
(K29) BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
PCM
TEST ACTION APPLICABILITY
1 NOTE: Verify battery voltage is greater than 10 volts.
Record Freeze Frame Data that was set by the related DTC before continuing.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Diagnostic category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition off.
Remove the Brake Lamp Switch and disconnect the harness connector.
Measure the resistance between the (Z1) Ground circuit terminal and the (K29)
Brake Switch Signal terminal at the Brake Lamp Switch.
Apply and release the brake pedal plunger while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit?
All
Yes → Go To 3
No → Replace the Brake Lamp Switch.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
3 Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K29) Brake Switch Signal circuit in
the Brake Lamp Switch harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the short to ground in the (K29) Brake Switch Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
212
DRIVEABILITY - NGC
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