TEST OR INSPECTION
Remove rings, wristwatches, neck chains, and any other jewelry before working
around vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry
and tools may short across electrical circuits and cause damage to equipment, or
severe burns or electrical shock to personnel.
Put crew cab air conditioner/ heater control panel switch to off position (WP 0008). Turn
battery disconnect switch to OFF position (WP 0007). Remove crew cab air
conditioner/heater assembly cover (WP 0200). Disconnect crew cab air conditioner/
heater blower motor red wire connector. Turn battery disconnect switch to ON position
(WP 0007). Put crew cab air conditioner/heater control panel switch to on position
(WP 0008). With a test lead set check for 22 to 28 VDC at red wire from crew cab air
conditioner/heater blower motor wire harness connector to a known good ground.
If 22 to 28 VDC are not present, go to Step 41.