P1573-BRAKE PEDAL STUCK OFF
For a complete wiring diagram Refer to Section 8W.
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When Monitored:
Ignition on, In plant mode passed the Applied test.
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Set Condition:
PCM recognizes the Brake Pedal could not electronically indicate the released (Off) position with both switches. If P1572 sets, P1573 will also set. One trip fault.
Possible Causes
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(B16) BRAKE SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE
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(B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO GROUND
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STOP LAMP SWITCH
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PCM
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
NOTE:
Make sure the Stop Lamp Switch is adjusted properly before continuing.
Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
No
2.
STOP LAMP SWITCH OPERATION
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connectors.
Measure the resistance between the (Z914) Ground circuit terminal and the (B15) Brake Signal 1 circuit terminal in the Stop Lamp Switch.
Apply and release the Stop Lamp Switch while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit when pressing and releasing the brake switch?
Yes
No
3.
STOP LAMP SWITCH OPERATION
Measure the resistance between the (F941) Fused Ignition Switch circuit terminal and the (B16) Brake Signal 2 circuit terminal in the Stop Lamp Switch.
Apply and release the Stop Lamp Switch while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit when pressing and releasing the Stop Lamp switch?
Yes
No
4.
(B16) BRAKE SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE
Disconnect the C3 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (B16) Brake Signal 2 circuit in the Stop Lamp Switch harness connector.
Is the voltage above 1.0 volt?
Yes
No
5.
(B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (B15) Brake Signal 1 circuit in the Stop Lamp Switch harness connector.
Is the resistance below 100 ohms?
Yes
No
6.
PCM
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
Yes
No