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P1695-BUS MESSAGE FROM BODY CONTROL MODULE
For a complete wiring diagramRefer to Section 8W.
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When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
Set Condition:
No BUS messages recieved from the BCM for 20 seconds.
Possible Causes
(D25) PCI BUS CIRCUIT OPEN
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.DTC RESET
Ignition on, engine not running.
With the scan tool, erase DTCs.
Cycle the ignition key on and off several times. Leaving the ignition on forat least 20 seconds.
With the scan tool, read DTCs.
Does the DTC reset?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.COMMUNICATE WITH FCM
With the scan tool, attempt to communicate with the FCM.
Can communication be established with the BCM?
Ye s>>
Go To 3
No>>
Refer to the Communication Category and perform the appropriate symptom related to no communica-
tion with FCM.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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3.(D25) PCI BUS CIRCUIT OPEN
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Disconnect the FCM harness connector.
NOTE: Inspect the PCI Bus terminal at both the PCM connectors
and the FCM connectors. Check for corrosion, damage or terminal
push out.
Measure the resistance of the (D25) PCI BUS circuit between the C3
PCM harness connector and the FCM harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Replace and program the Powertrain Control Module per
Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Repair the open in the (D25) PCI BUS circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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P1696-PCM FAILURE EEPROM WRITE DENIED
For a complete wiring diagramRefer to Section 8W.
When Monitored:
Ignition on and battery voltage greater than 10 volts.
Set Condition:
An attempt to program/write to the internal EEPROM failed, also checks at powerdown.
Possible Causes
SRI MILEAGE INVALID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.SCAN TOOL DISPLAYS WRITE FAILURE
Ignition on, engine not running.
With the scan tool, perform the SRI Memory Test.
Does the scan tool display Write Failure?
Ye s>>
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 2
2.SCAN TOOL DISPLAYS WRITE REFUSED
With the scan tool, perform the SRI Memory Test.
Does the scan tool display Write Refused?
Ye s>>
Go To 3
No>>
Go To 4
3.PCM REFUSED 2ND TEST
With the scan tool, perform the SRI Memory Test a second time.
NOTE: Retest the SRI Memory two more times.
Does the scan tool display Write Refused again?
Ye s>>
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
4.SCAN TOOL DISPLAYS SRI MILEAGE INVALID
With the scan tool, perform the SRI Memory Test.
Does the scan tool display SRI Mileage Invalid?
Ye s>>
Update the mileage and retest the SRI Memory.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 5
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5.COMPARE SRI MILEAGE WITH ODOMETER
Compare the SRI Mileage stored with the Instrument Panel Odometer.
Is the mileage within the specified range displayed on the scan tool?
Ye s>>
Te s t C o m p l e t e .
No>>
Update the mileage and retest the SRI Memory.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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*BRAKE SWITCH SENSE STATUS DOES NOT CHANGE ON THE SCAN TOOL
For a complete wiring diagramRefer to Section 8W.
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Possible Causes
(A103) FUSED B+ CIRCUIT
(Z429) BRAKE LAMP SWITCH GROUND CIRCUIT OPEN
BRAKE LAMP SWITCH
(B29) BRAKE SWITCH NO.1 SIGNAL CIRCUIT OPEN
(B29) BRAKE SWITCH NO.1 SIGNAL CIRCUIT SHORT TO GROUND
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.SCAN TOOL DOES NOT SHOW BRAKE SW PRESSED OR RELEASED
Ignition on, engine not running.
With the scan tool in Inputs/Outputs, read the Brake Switch state.
While observing the scan tool display, press and release the brake pedal several times.
Does the scan tool display Brake Switch PRESSED and RELEASED?
Ye s>>
The Brake Lamp Switch is operating properly at this time.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 2
2.(A103) FUSED B+ CIRCUIT OPEN
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, probe the (A103) Fused
B+ circuit at the Brake Lamp Switch harness connector.
Does the test light illuminate brightly?
Ye s>>
Go To 3
No>>
Repair the open or short to ground in the (A103) Fused B+
circuit. Check and replace fuses as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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3.(Z429) BRAKE LAMP SWITCH GROUND CIRCUIT OPEN
Using a 12-volt test light connect to 12-volts, probe the (Z429) Brake
Lamp Switch ground circuit.
Does the test light illuminate brightly?
Ye s>>
Go To 4
No>>
Repair the open in the (Z429) Brake Lamp Switch Ground
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
4.BRAKE LAMP SWITCH
Measure the resistance across the (B29) Brake Lamp Switch Signal terminaland the (Z429) Ground terminal (mea-
surement taken across the switch).
Apply and release the Brake Pedal while monitoring the ohmmeter.
Does the resistance change frombelow 5.0 ohms to open circuit?
Ye s>>
Go To 5
No>>
Replace the Brake Lamp Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.(B29) BRAKE LAMP SWITCH SIGNAL CIRCUIT OPEN
Disconnect the C3 PCM harness connector.
Measure the resistance of the (B29) Brake Lamp Switch Signal circuit
from the Stop Lamp Switch harness connector to the C3 PCM harness
connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 6
No>>
Repair the open in the (B29) Brake Lamp Switch Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)