Dodge Caliber. Manual — part 970
P0573 BRAKE SWITCH 1 STUCK OFF
For a complete wiring diagram Refer to Section 8W
PM
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1167
•
When Monitored:
With the ignition on.
•
Set Condition:
The Engine Control Module (ECM) detects that the vehicle has stopped and no brake switch signal was
received.
Possible Causes
INTERMITTENT CONDITION
BRAKE SWITCH SIGNAL 2 - SWITCH 2 CKT OPEN
(A924) FUSED B+ CIRCUIT OPEN
(B215) BRAKE SWITCH SIGNAL 2 CIRCUIT SHORTED TO GROUND
BRAKE SWITCH SIGNAL 1 - SWITCH 1 CKT OPEN
(B215) BRAKE SWITCH SIGNAL 2 CIRCUIT OPEN
(Z967) STOP LAMP SWITCH GROUND CIRCUIT OPEN
(B15) BRAKE SWITCH SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE
(B15) BRAKE SWITCH SIGNAL 1 CIRCUIT OPEN
ENGINE CONTROL MODULE - BRAKE SWITCH SIGNAL 2
ENGINE CONTROL MODULE - INTERNAL
ENGINE CONTROL MODULE - BRAKE SWITCH SIGNAL 1
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
CHECK THE BRAKE SWITCH SIGNAL 1 STATUS
Turn the ignition on.
While observing the BRAKE SWITCH SIGNAL 1 status on the scan tool display, press and release the brake pedal
several times.
Does the scan tool display BRAKE SWITCH SIGNAL1: PRESSED and RELEASED for the appropriate
pedal position?
Yes
>> Go To 2
No
>> Go To 11
2.
CHECK THE BRAKE SWITCH SIGNAL 2 STATUS
While observing the BRAKE SWITCH SIGNAL 2 status on the scan tool display, press and release the brake pedal
several times.
Does the scan tool display BRAKE SWITCH SIGNAL 2: PRESSED and RELEASED for the appropriate
pedal position
Yes
>> Go To 3
No
>> Go To 4
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
3.
INTERMITTENT CONDITION
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT
PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identi-
fying the intermittent condition.
With the engine running at normal operating temperature, monitor the scan tool parameters related to the DTC while
wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the
DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any of the above conditions present?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Test Complete.
4.
(B215) BRAKE SWITCH SIGNAL 2 CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connector.
Turn the ignition on.
Measure the voltage between the (B215) Brake Switch Signal 2 circuit
and ground at the Stop Lamp Switch harness connector.
Is the voltage above 9.0 volts?
Yes
>> Go To 5
No
>> Go To 8
5.
STOP LAMP SWITCH - BRAKE SWITCH SIGNAL 2 CKT OPEN
While monitoring the BRAKE SWITCH 2 status with the scan tool, connect a jumper wire between ground and the
(B215) Brake Switch Signal 2 circuit.
Does the scan tool display change from PRESSED to RELEASED?
Yes
>> Adjust or replace the Stop Lamp Switch in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 6
PM
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1169
6.
(Z967) STOP LAMP SWITCH GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connector.
Measure the resistance between ground and the (Z967) Stop Lamp
Switch Ground circuit at the Stop Lamp Switch harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Go To 7
No
>> Repair the (Z967) Stop Lamp Switch Ground circuit for an
open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
7.
ENGINE CONTROL MODULE - INTERNAL
If there are no possible causes remaining, view repair.
Repair
Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
8.
(B215) BRAKE SWITCH SIGNAL 2 CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the (B215) Brake Switch
Signal 2 circuit at the Stop Lamp Switch harness connector.
Is the resistance above 1000 ohms?
Yes
>> Go To 9
No
>> Repair the (B215) Brake Switch Signal 2 circuit for a short
to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
9 - 1170
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
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