TEST OR INSPECTION
Installing jumperwire in place of relay 17 across terminal 3 wire 2852 and terminal 4 wire
1435 on cab power distribution block prevents having to start and stop vehicle engine
during testing. Leave jumperwire in place throughout testing.
Open driver side discharge drain valve door (WP 0010). Disconnect pump house wire
harness pump house diagnostic module connector. Install jumperwire across wire 2852
and wire 4086 in pump house wire harness pump house diagnostic module connector,
terminal A and terminal B. Turn battery disconnect switch to ON position (WP 0007).
Check if pump house heater operates.
If rear compartment heater does not operate, troubleshoot Pump House