BLOWER MOTOR
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO PASSIVE RESTRAINT SYSTEMS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
For circuit descriptions and diagrams, refer to Air
Conditioning/Heater in Group 8W - Wiring Diagrams.
Possible causes of an inoperative front or rear blower
motor include:
• Faulty fuse (the rear blower motor fuse is
located in the relay and fuse block located on the
back of the junction block)
• Faulty blower motor circuit wiring or wire har-
ness connectors
• Faulty blower motor resistor
• Faulty blower motor relay (Voltage Reduction
Relay or VRR) (front only)
• Faulty blower motor switch
• Faulty heater-A/C mode control switch (front
only)
• Faulty high speed blower motor relay (front
only)
• Faulty blower motor.
Possible causes of the front or rear blower motor
not operating in all speeds include:
• Faulty fuse (the rear blower motor fuse is
located in the relay and fuse block located on the
back of the junction block)
• Faulty blower motor switch
• Faulty blower motor resistor
• Faulty blower motor relay (front only)
• Faulty blower motor circuit wiring or wire har-
ness connectors
• Faulty high speed blower motor relay (front
only).
VIBRATION
Possible causes of front or rear blower motor vibra-
tion include:
• Improper blower motor mounting
• Improper blower wheel mounting
• Blower wheel out of balance or deformed
• Blower motor faulty.
NOISE
To determine that the rear blower is the source of
the noise, simply switch the blower motor from off to
on. There are no other moving parts involved in the
rear overhead A/C unit, which makes it simple to
identify the source of the noise. To verify that the
front blower is the source of the noise, unplug the
front blower motor wire harness connector and oper-
ate the heater-A/C system. If the noise goes away,
possible causes include:
• Foreign material in the heater-A/C housing
• Improper blower motor mounting
• Improper blower wheel mounting
• Blower motor faulty.
BLOWER MOTOR RELAY
RELAY TEST
The blower motor relay (Voltage Reduction Relay
or VRR) (Fig. 6) is mounted with a single screw
directly to the instrument panel’s structural plastic
inside the glove box opening, next to the left-side
energy-absorbing bracket (Fig. 7). Remove the blower
motor relay to perform the following tests:
(1) A relay in the de-energized position should
have continuity between terminals 87A and 30, and
no continuity between terminals 87 and 30. If OK, go
to Step 2. If not OK, replace the faulty relay.
(2) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 75 6 5 ohms. If OK, go to Step
3. If not OK, replace the faulty relay.
(3) Connect a battery to terminals 85 and 86.
There should now be continuity between terminals
30 and 87, and no continuity between terminals 87A
and 30. If OK, see Relay Circuit Test in the Diagno-
sis and Testing section of this group. If not OK,
replace the faulty relay.
TERMINAL LEGEND
NUMBER IDENTIFICATION
30 COMMON FEED
85 COIL GROUND
86 COIL BATTERY
87 NORMALLY OPEN
87A NORMALLY CLOSED
Fig. 6 Blower Motor Relay
DN HEATING AND AIR CONDITIONING 24 - 15
DIAGNOSIS AND TESTING (Continued)
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