Inspection and Verification

WARNING: Always disconnect the battery ground cable at the battery before disconnecting the starter motor battery terminal lead. If a tool is shorted at the starter motor battery terminal, the tool can quickly heat enough to cause a skin burn. Failure to follow this instruction may result in serious personal injury.

NOTE: The anti-theft system must be functioning correctly before a logical starting system diagnosis can be carried out. Address anti-theft system concerns before continuing.

Verify the customer concern by operating the starting system to duplicate the conditions.

Inspect to determine if any of the following mechanical or electrical concerns apply.

VISUAL INSPECTION CHART

Mechanical	Electrical
Starter motor Brackets	Battery Open fuse Smart junction box (SJB) fuse: 27 (20A) Battery junction box (BJB) fuse: 41 (30A) Damaged wiring harness Starter relay Anti-theft system Loose or corroded connections

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no communication with the scan tool.
If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the powertrain control module (PCM).
Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
- If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
Clear the continuous DTCs and carry out the self-test diagnostics for the powertrain control module (PCM).
If the DTCs retrieved are related to the concern, go to Starter and Passive Anti-Theft System (PATS) Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
If no DTCs related to the concern are retrieved, go to Symptom Chart .

PASSIVE ANTI-THEFT SYSTEM (PATS) - DIAGNOSTIC TROUBLE CODE (DTC) CHART

DTC	Description	Source	Action
B1213	Anti-Theft Number of Programmed Keys is Below Minimum	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B1342	ECU is Defective	Instrument Cluster	CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS .
B1600	Passive Anti-Theft System (PATS) Key Transponder Signal is Not Received	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B1601	PATS Received Incorrect Key-Code From Ignition Key Transponder	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B1602	PATS Received Invalid Format of Key-Code From Ignition Key Transponder	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B1681	PATS Transceiver Module Signal is Not Received	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B2103	Antenna Not Connected	Instrument Cluster	REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
B2431	Key Program Failure (Defective Key or Transceiver)	Instrument Cluster	VERIFY if the correct PATS key is being used. If the PATS key is defective, use a new key for programming. REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
P1260	PCM Disabled - Vehicle Disabled	Instrument Cluster	REPAIR the PCM. REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.