NOTE: Always check module power and ground circuits prior to replacing a control module. See appropriate wiring diagram in DATA LINK CONNECTORS, GROUND DISTRIBUTION or POWER DISTRIBUTION article in WIRING DIAGRAMS.

SYMPTOM INDEX

Symptom	Perform Test
4-Wheel Anti-Lock Brake System Module Does Not Respond To NGS Tester	A
Generic Electronic Module/Central Timer Module Does Not Respond To NGS Tester	B
Restraint Control Module Does Not Respond To NGS Tester	C
Remote Anti-Theft Personality Module Does Not Respond To NGS Tester	D
Powertrain Control Module Does Not Respond To NGS Tester	E
Air Suspension Control Module Does Not Respond To NGS Tester	F
Electronic Automatic Temperature Control Module Does Not Respond To NGS Tester	G
Driver Seat Module Does Not Respond To NGS Tester	H
Parking Aid Module Does Not Respond To NGS Tester	I
Passive Anti-Theft System Module Does Not Respond To NGS Tester	J
No Module/Network Communications - ISO 9141 Network	K
No Module/Network Communications - SCP Network	L
No Module/Network Communication - No Power To NGS Tester	M

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

System Tests: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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