Has the HVAC Blower Controls System Check been performed?

--

Go to Step 2

Go to HVAC Blower Controls System Check

1. Disconnect the auxiliary blower resistor.
2. Connect a jumper wire between cavities A and B of the resistor connector.
3. Rotate the auxiliary HVAC control module switch to the Med position.

Does the auxiliary blower motor spin?

--

Go to Step 3

Go to Step 4

Replace the auxiliary blower resistor. Refer to Auxiliary Blower Motor Resistor Replacement .

Is the repair complete?

--

Go to HVAC Blower Controls System Check

--

1. Disconnect the auxiliary blower motor.
2. Connect a J 39200 (continuity) between cavity B of the resistor connector and cavity A of the blower connector.

Is continuity present?

--

Go to Step 6

Go to Step 5

Locate and repair the open in CKT 1172 (YEL) between the resistor connector and splice S402. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to HVAC Blower Controls System Check

--

1. Connect all disconnect components.
2. Remove both the low and medium auxiliary blower motor relays.
3. Connect a fused jumper wire between cavities 5 and 2 of both socket relays with the blower switch in Low and Med.
4. Switch the front auxiliary switch to Rear.
5. Rotate the rear switch to both Med and Low.

Does the auxiliary blower motor operate in all positions tested?

--

Go to Step 10

Go to Step 7

1. Remove both the front and rear Auxiliary HVAC Control Modules.
2. Using a J 39200 (continuity) test each switch for continuity between the ground pin and the Low and Med pins of the switch.
3. Check the front switch set in the Rear position.

Is continuity present on both switches?

--

Go to Step 9

Go to Step 8

Replace the auxiliary HVAC control module. Refer to Auxiliary Air Conditioning (A/C) Control Assembly Replacement - Front or Control Assembly Replacement - Auxiliary .

Is the repair complete?

Go to HVAC Blower Controls System Check

--

Locate and repair the open the circuit(s) between cavity 2 of the relay socket and the auxiliary HVAC control modules, front and rear. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to HVAC Blower Controls System Check

--

Replace both auxiliary blower motor relays. Refer to Auxiliary Blower Motor Relay Replacement .

Is the repair complete?

--

Go to HVAC Blower Controls System Check

--