Chrysler RG Voyager. Manual — part 584
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. Three Global Good Trips to Clear.
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 DRBIII
t, 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.
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.
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.
No
→ Go To 4
218
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
4
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.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
219
DRIVEABILITY - NGC
P0572-BRAKE SWITCH #1 CIRCUIT LOW —
Continued
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. Three good trips to turn off the MIL.
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 DRBIII
t, 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.
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.
220
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K29) Brake Switch Signal circuit from the Brake
Lamp Switch harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the open in the (K29) Brake Switch Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Measure the resistance between the (Z2) Ground circuit and ground at the Brake
Lamp Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the open in the (Z1) Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
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.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
221
DRIVEABILITY - NGC
P0573-BRAKE SWITCH #1 CIRCUIT HIGH —
Continued
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