Symptom:
P0573-BRAKE SWITCH #1 CIRCUIT HIGH
When Monitored and Set Condition:
P0573-BRAKE SWITCH #1 CIRCUIT HIGH
When Monitored: Ignition on.
Set Condition: When the PCM recognizes Brake Switch is stuck in the high/off position.
One Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
BRAKE LAMP SWITCH OPERATION
(K29) BRAKE SWITCH SIGNAL CIRCUIT OPEN
(Z1) GROUND CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
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 in the symptom
Diagnostic category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between the (Z1) Ground circuit terminal and the (K29)
Brake Switch Signal circuit terminal in the Brake Lamp Switch.
Apply and release the brake pedal 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.
214
DRIVEABILITY - NGC
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