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.
Turn battery disconnect switch to OFF position (WP 0007). Disconnect pump house
wire harness pump house heater 4-terminal connector. Install jumperwire into pump
house wire harness pump house heater diagnostic module connector, terminal A wire
2852 and terminal B wire 4086. Turn battery disconnect switch to ON position
(WP 0007). With a test lead set, check for 22 to 28 VDC between pump house wire
harness wire 4086 (yellow) at pump house wire harness pump house heater 4-terminal
connector, terminal 2 and a known good ground.
If 22 to 28 VDC are present, replace pump house heater (WP 0469).