4WD Indicator Inoperative

Possible Causes:

Transfer Case Switch
Transfer Case Switch Ground Circuit Open
Indicator Circuit Open
Indicator LED
Instrument Cluster

Testing

Turn ignition on. Using scan tool, select BODY, ELECTRO/MECH CLUSTER, then INPUTS/OUTPUTS. Move transfer case shift lever from 2H to 4H or 4L. If scan tool does not display 4WD SWITCH CLOSED with transfer case shift lever in 4H or 4L, go to next step. If scan tool displays 4WD SWITCH CLOSED with transfer case shift lever in 4H or 4L, go to step 5 .
Turn ignition off. Disconnect transfer case switch connector. See Figure . Connect a jumper wire between transfer case switch harness connector terminals. Turn ignition on. If scan tool does not display 4WD SWITCH CLOSED, go to next step. If scan tool displays 4WD SWITCH CLOSED, replace transfer case switch.
Disconnect jumper wire. Turn ignition off. Connect a jumper wire between transfer case switch harness connector terminal "A" (Black/Red wire) and ground. See Figure . Turn ignition on. If scan tool does displays 4WD SWITCH CLOSED, go to next step. If scan tool does not display 4WD SWITCH CLOSED, repair open on Black/Red wire between transfer case switch harness connector terminal "A" and instrument cluster connector C2 terminal No. 16. See Figure and Figure .
Turn ignition off. Check resistance between transfer case switch harness connector terminal "A" (Black/Red wire) and ground. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Black/Red wire.
Remove LED indicator from instrument cluster. Using DVOM in diode mode, connect Red lead to "+" diode terminal and Black lead to "-" diode terminal. If LED illuminates, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. If LED does not illuminate, replace LED.