Compressor Clutch Relay; High Pressure Cut-Off Switch; High Speed Blower Motor Relay - Jeep Wrangler 1997 Manual

TJ
DIAGNOSIS AND TESTING (Continued)
(a)
If the clutch coil current reading is four
amperes or more, the coil is shorted and should be
replaced .
(b) If the clutch coil current reading is zero, the
coil is open and should be replaced .
COMPRESSOR CLUTCH RELAY
For circuit descriptions and diagrams, refer to
8W-42 - Air Conditioning/Heater in Group 8W - Wir-
ing Diagrams .
WARNING : ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO GROUP 8M
-
PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING
STEERING WHEEL, STEERING COLUMN,
OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
The compressor clutch relay is located in the Power
Distribution Center (PDC) . Refer to the PDC label for
relay identification and location . Remove the relay
from the PDC 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±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 the Circuit Test in this group . If
not OK, replace the faulty relay .
87A 87 85
v
e
30 86
TERMINAL LEGEND
NUMBER
I
IDENTIFICATION
30
86
87
COMMON FEED
COIL GROUND
COIL BATTERY
NORMALLY OPEN
87A NORMALLY CLOSED
Compressor Clutch Relay
9514-16
HEATING AND AIR CONDITIONING
24- 1 7
CIRCUIT TEST
For circuit descriptions and diagrams, refer to
8W-42 - Air Conditioning/Heater in Group 8W - Wir-
ing Diagrams .
(1) The relay common feed terminal cavity (30) is
connected to fused battery feed . There should be bat-
tery voltage at the cavity for relay terminal 30 at all
times . If OK, go to Step 2 . If not OK, repair the open
circuit to the PDC fuse as required .
(2) The relay normally closed terminal (87A) is not
used in this application . Go to Step 3 .
(3) The relay normally open terminal cavity (87) is
connected to the compressor clutch coil . There should
be continuity between this cavity and the A/C com-
pressor clutch relay output circuit cavity of the
compressor clutch coil connector. If OK, go to Step 4 .
If not OK, repair the open circuit as required .
(4) The relay coil battery terminal (86) is con-
nected to the fused ignition switch output (run/
start) circuit . There should be battery voltage at the
cavity for relay terminal 86 with the ignition switch
in the On position . If OK, go to Step 5 . If not OK,
repair the open circuit to the fuseblock module as
required .
(5) The coil ground terminal cavity (85) is switched
to ground through the Powertrain Control Module
(PCM) . There should be continuity between this cav-
ity and the A/C compressor clutch relay control
circuit cavity of the PCM connector at all times . If
not OK, repair the open circuit as required .
HIGH PRESSURE CUT-OFF SWITCH
For circuit descriptions and diagrams, refer to
8W-42 - Air Conditioning/Heater in Group 8W - Wir-
ing Diagrams .
(1) Verify that the refrigerant system is properly
charged .
(2) Unplug the high pressure switch connector and
test for continuity between the switch terminals .
There should be continuity . If OK, refer to the wiring
diagrams and repair the circuits as required . If not
OK, replace the faulty switch .
HIGH SPEED BLOWER MOTOR RELAY
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.