Retrieving On-Demand Diagnostic Trouble Codes

Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to data link connector. Enter vehicle information on NGS tester. After all vehicle options are selected, press SAVE key. Select DIAGNOSTIC DATA LINK TEST, then select GEM - GENERIC ELECTRONIC MODULE on NGS tester. Enter appropriate vehicle options on NGS tester. Select DIAGNOSTIC TEST MODE. Select ON-DEMAND SELF-TEST. Record all DTCs.

GENERIC ELECTRONIC MODULE DTC DEFINITIONS

DTC ⁽¹⁾

Description

Perform Test

B1322

Left Front Door Ajar Switch Circuit Short To Ground

⁽²⁾⁽³⁾W

B1323

Door Ajar Light Circuit Failure

B1325

Door Ajar Light Circuit Short To Voltage

B1330

Right Front Door Ajar Circuit Short To Ground

⁽³⁾W

B1342

Defective GEM

Replace GEM

B1426

Seat Belt Light Circuit Short To Voltage

B1428

Seat Belt Light Circuit Failure

B1462

Seat Belt Switch Circuit Failure

⁽³⁾X

B1577

Park Lamp Short To Voltage

Check Circuit

P1804

4WD High Indicator Circuit Failure

P1806

4WD High Indicator Circuit Short To Voltage

P1808

4WD Low Indicator Circuit Failure

P1810

4WD Low Indicator Circuit Short To Voltage

⁽¹⁾	Testing for DTCs not listed, see MODULE COMMUNICATIONS NETWORK - PICKUP article.

⁽²⁾	Test interior light wiring and repair as necessary. See appropriate wiring diagram in ILLUMINATION/INTERIOR LIGHTS article.

⁽³⁾	Perform wiggle test. Tap, move, and wiggle wiring harness and connectors while monitoring scan tool.

SYMPTOM CHART

Symptom	Go To Test
Fuel Gauge Inaccurate	A
Coolant Temperature Gauge Inaccurate	B
Oil Pressure Gauge Inaccurate	C
Speedometer Inaccurate	D
Speedometer/Odometer Inoperative	E
Tachometer Inoperative	G
Tachometer Inaccurate	H
Charge Indicator Always/Never On	J
Anti-Lock Brake Warning Light Inoperative	K
CHECK FUEL CAP Light Inoperative	L
High Beam Indicator Inoperative	M
CHECK ENGINE Light Inoperative	N
Turn Indicator Inoperative	P
Overdrive Off Indicator Inoperative	Q
Cruise Control Indicator Never/Always On	R
Red BRAKE Warning Light Inoperative	S
CHECK GAUGES Indicator Inoperative	T
AIR BAG Indicator Inoperative	V
DOOR AJAR Indicator Inoperative	W
Seat Belt Warning Indicator Inoperative	X
4WD HIGH, 4WD LOW Indicator Inoperative	Y