Jeep Cherokee (XJ): Diagnosis and testing
When diagnosing the turn signal or hazard warning
circuits, remember that high generator output
can burn out bulbs rapidly and repeatedly. If this is a
problem on the vehicle being diagnosed, refer to
Charging System in the Diagnosis and Testing section
of Group 8C - Charging System for further diagnosis
of a possible generator overcharging condition.
If the problem being diagnosed is related to a failure
of the turn signals to automatically cancel following
completion of a turn, inspect the multi-function
switch for a faulty or damaged cancel actuator and
inspect the turn signal cancelling cam lobes on the
clockspring mechanism for damage or improper
installation. For complete circuit diagrams, refer to
Turn Signals in the Contents of Group 8W - Wiring
Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
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 PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG
DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Turn the ignition switch to the On position.
Actuate the turn signal switch or the hazard warning
switch. Observe the turn signal indicator 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. If the turn signal indicator(
s) fail to light, go to Step 2.
(2) Turn the ignition switch to the Off position.
Check the turn signal fuse in the junction block
and/or the hazard warning fuse in the Power Distribution
Center (PDC). 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 hazard warning
fuse in the PDC. If OK, go to Step 4. If not OK,
repair the open fused B(+) circuit to the battery as
required.
(4) Turn the ignition switch to the On position.
Check for battery voltage at the turn signal fuse in
the fuseblock module. If OK, go to Step 5. If not OK,
repair the open fused ignition switch output (accessory/
run) circuit to the ignition switch as required.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the combination flasher from its wire harness
connector 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, discard the faulty combination flasher.
If not OK, remove the test flasher and go to Step 6.
(6) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (accessory/run) circuit cavity in the combination
flasher wire harness connector. If OK, go to Step
7. If not OK, go to Step 9. (7) Turn the ignition switch to the Off position.
Place the hazard warning switch in the On position.
Check for battery voltage again at the fused B+ circuit
cavity in the combination flasher wire harness
connector. If OK, go to Step 8. If not OK, go to Step 9.
(8) Disconnect and isolate the battery negative
cable. Check for continuity between the ground circuit
cavity of the combination flasher wire harness
connector and a good ground. There should be continuity.
If OK, go to Step 9. If not OK, repair the open
ground circuit to ground as required.
(9) Disconnect the instrument panel wire harness
connector from the multi-function switch connector
receptacle. Check for continuity between the turn signal
output circuit cavities in the combination flasher
wire harness connector and in the instrument panel
wire harness connector for the multi-function switch.
There should be continuity. If OK, go to Step 10. If
not OK, repair the open turn signal output circuit as
required.
(10) Check for continuity between the hazard
warning output circuit cavities in the combination
flasher wire harness connector and in the instrument
panel wire harness connector for the multi-function
switch. There should be continuity. If OK, refer to
Turn Signal Switch and Hazard Warning Switch
in the Diagnosis and Testing section of this group. If
not OK, repair the open hazard warning output circuit
as required. The turn signal switch and the hazard warning
switch are integral to the multi-function switch.
Refer to Turn Signal and Hazard Warning Systems
in the Diagnosis and Testing section of this
group before testing the multi-function switch. For
complete circuit diagrams, refer to Turn Signals in
the Contents of Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
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 PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable. Disconnect the instrument panel wire harness
connector from the multi-function switch connector
receptacle.
(2) Using an ohmmeter, perform the switch continuity
checks at the connector receptacle terminals as
shown in the Multi-Function Switch Continuity chart
(Fig. 3).
(3) If the turn signal switch or hazard warning
switch fails any of the continuity checks, replace the
faulty multi-function switch assembly as required. If
the switch circuits are OK, repair the lighting circuits
as required.Turn signal and hazard warning
systems
Turn signal switch and hazard
warning switch
Fig. 3 Multi-Function Switch Continuity
Other materials:
Description and operation
Propeller shaft
DESCRIPTION
A propeller shaft (Fig. 2) is the shaft which connects
the transmission/transfer case to the axle differential.
This is the link through which the engine
power is transmitted to the axle.
The propeller shaft is designed and built with the
yoke lugs in line with ...