Diagnostic Procedure

1. Turn ignition to the RUN position and check operation of HVAC blower motor to verify which speeds are not functioning.

2. If blower motor does not operate in any other speed than HI, check the 20A HVAC Sw fuse in the left instrument panel fuse block (LIPFB).

^ If fuse is not OK, refer to "HVAC Blower Controls" schematic in the 2000/2001 L-Series HVAC Service Manual and perform additional diagnostics as necessary.

^ If fuse is OK, proceed to the next step.

3. Turn HVAC blower control to a non-functioning blower speed.

4. Remove right side I/P lower dash insulator retainers.

5. Pull insulator rearward to detach from forward insulator retainers.

6. Remove right side heater outlet assembly retainer and remove outlet.

7. Use a DVOM to backprobe and check for voltage at blower motor resistor card between terminal C (YEL ckt 268) and ground.

^ If voltage is present at terminal C, refer to "HVAC Blower Controls" schematic in the 2000/2001 L-Series HVAC Service Manual and perform additional diagnostics as necessary.

^ If voltage is not present, proceed to next step.

8. Disconnect blower motor resistor card connector. Use a DVOM to check voltage at the appropriate blower motor resistor card terminals of non-functional speeds.

Speed Terminal

LO D

M1 A

M2 B

^ If voltage is present on all non-functional speeds, replace blower motor and resistor card. Follow procedures outlined in this bulletin.

^ If voltage is not present on all non-functional speeds, refer to "HVAC Blower Controls" schematic in the 2000/2001 L-Series HVAC Service Manual and perform additional diagnostics as necessary.