Jeep Grand Cherokee Wj 2000 Manual - page 6
the hazard warning (left multi-function) switch on
the steering column, or by the BCM on the back of
the junction block.
DIAGNOSIS AND TESTING
TURN SIGNAL AND HAZARD WARNING
SYSTEMS
For complete circuit diagrams, refer to Turn Sig-
nals in the Contents of Group 8W - Wiring Dia-
grams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
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.
(1) Turn the ignition switch to the On position.
Activate the turn signal switch by moving the left
multi-function switch control stalk up (right turn)
and/or down (left turn). Observe the turn signal indi-
cator lamp(s) in the instrument cluster. If the flash
rate is very high, check for a turn signal bulb that is
not lit or is very dimly lit. Repair the circuits to that
lamp or replace the faulty bulb, as required. Test the
operation of the turn signal system again. If the turn
signal indicator(s) fail to light, go to Step 2.
(2) Turn the ignition switch to the Off position.
Check the fused B(+) fuse in the junction block. If
OK, go to Step 3. If not OK, repair the shorted circuit
or component as required and replace the faulty
fuse(s).
(3) Check for battery voltage at the fused B(+) fuse
in the junction block. If OK, go to Step 4. If not OK,
repair the open fused B(+) circuit to the Power Dis-
tribution Center (PDC) fuse as required.
(4) Check the fused ignition switch output (run)
fuse in the junction block. If OK, go to Step 5. If not
OK, repair the shorted circuit or component as
required and replace the faulty fuse.
(5) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run) fuse in the junction block. If OK, go to
Step 6. If not OK, repair the open fused ignition
switch (run) circuit to the ignition switch as required.
(6) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the combination flasher from the junction
block and replace it with a known good unit. Connect
the battery negative cable. Test the operation of the
turn signal and hazard warning systems. If OK, dis-
card the faulty combination flasher. If not OK,
remove the test flasher and go to Step 7.
(7) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run) circuit cavity for the combination flasher
in the junction block. If OK, go to Step 8. If not OK,
repair the open fused ignition switch output (run) cir-
cuit to the junction block fuse as required.
(8) Turn the ignition switch to the Off position.
Check for battery voltage at the fused B(+) circuit
cavity for the combination flasher in the junction
block. If OK, go to Step 9. If not OK, repair the open
fused B(+) circuit to the junction block fuse as
required.
(9) Disconnect and isolate the battery negative
cable. Disconnect the instrument panel wire harness
connector from the turn signal and hazard warning
(left
multi-function)
switch
connector
receptacle.
Check for continuity between the ground circuit cav-
ity of the instrument panel wire harness connector
for the left multi-function switch and a good ground.
There should be continuity. If OK, go to Step 10. If
not OK, repair the open ground circuit to ground as
required.
(10) Check for continuity between the hazard
switch sense circuit cavity of the instrument panel
wire harness connector for the left multi-function
switch and a good ground. There should be no conti-
nuity. If OK, go to Step 11. If not OK, repair the
shorted hazard switch sense circuit as required.
(11) Check for continuity between the hazard
switch sense circuit cavities of the junction block for
the combination flasher and the instrument panel
wire harness connector for the left multi-function
switch. There should be continuity. If OK, go to Step
12. If not OK, repair the open hazard switch sense
circuit as required.
(12) Check for continuity between the left turn
switch sense circuit cavity of the instrument panel
wire harness connector for the left multi-function
switch and a good ground. There should be no conti-
nuity. If OK, go to Step 13. If not OK, repair the
shorted left turn switch sense circuit as required.
(13) Check for continuity between the left turn
switch sense circuit cavities of the junction block for
the combination flasher and the instrument panel
wire harness connector for the left multi-function
switch. There should be continuity. If OK, go to Step
14. If not OK, repair the open left turn switch sense
circuit as required.
(14) Check for continuity between the right turn
switch sense circuit cavity of the instrument panel
wire harness connector for the left multi-function
switch and a good ground. There should be no conti-
nuity. If OK, go to Step 15. If not OK, repair the
shorted right turn switch sense circuit as required.
8J - 6
TURN SIGNAL AND HAZARD WARNING SYSTEMS
WJ
DESCRIPTION AND OPERATION (Continued)