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System Tests: Notes

CAUTION: Disconnect negative battery cable before disconnecting GEM connector. Failure to do so can result in GEM storing erroneous codes and may also result in erratic operation of GEM after repairs.
NOTE: If concern is that indicator never illuminates, check bulb before performing system tests. See USING HYBRID ELECTRONIC CLUSTER  under SELF-DIAGNOSTIC SYSTEM. This will command all instrument cluster bulbs and LEDs to illuminate.
SYMPTOM INDEX

Symptom Perform Test
No Communication With Hybrid Electronic Cluster A 
No Communication With Generic Electronic Module B 
A Single Gauge Does Not Return To Zero With Key Off (1)
Fuel Sender Open, Shorted Or Inaccurate C 
LOW FUEL Indicator Never Or Always On D 
Oil Gauge Reads Normal With Engine Off (1)
Voltmeter Inaccurate (2)
Oil Pressure Gauge Inaccurate E 
Low Oil Warning Light Stays On & Temperature Gauge Reads Normally E 
Temperature Gauge Inaccurate F 
Temperature Warning Light Flickers, Temperature Gauge Reads Fully Hot (1)
Speedometer/Odometer Inoperative G 
Tachometer Inoperative (1)
Tachometer Inaccurate (1)
Low Oil Pressure Indicator Light Inoperative Or Always On (1)
Safety Belt Indicator Light Inoperative (Chime Operative) H 
Safety Belt Indicator Light Does Not Operate Correctly (Chime Okay) I 
DOOR AJAR Light Inoperative (Chime Okay) J 
DOOR AJAR Light Does Not Operate Correctly (Chime Okay) K 
BRAKE Warning Light Inoperative Or Always On L 
Charging System Indicator Light Inoperative Or Always On M 
4X4 Indicator Light Inoperative Or Always On N 
LOW RANGE Light Inoperative Or Always On N 
High Beam Indicator Light Inoperative Or Always On O 
Air Bag Warning Light Inoperative Or Always On (3)
ABS Warning Light Inoperative Or Always On P 
CK SUSP Light Inoperative Or Always On Q 
SERVICE ENGINE SOON Light Inoperative Or Always On R 
Turn/Hazard Indicator Light Inoperative Or Always On S 
Speed Control Indicator Is Never On T 
THEFT Indicator Light Inoperative Or Always On (4)
LOW WASHER Light Inoperative Or Always On U 
Integrated Circuit Display Inoperative Or Erratic (5)
(1) Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system.
(2) See GENERATORS & REGULATORS article in ELECTRICAL.
(3) See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.
(4) See ANTI-THEFT SYSTEMS - PASSIVE article.
(5) Perform instrument cluster self-test.
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