Jeep Wrangler TJ. Manual — part 32
Symptom:
*TEMPERATURE DISPLAY INACCURATE OR INOPERATIVE
POSSIBLE CAUSES
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT OPEN
COMPASS/TEMPERATURE MIRROR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Measure the resistance of the Ambient Temperature Sensor between pin 1 and pin 2.
The Ambient Temperature Sensor should measure within the following values:
10°C (50°F) Sensor Resistance = 17.99k - 21.81k Ohms
20°C (68°F) Sensor Resistance = 11.37k - 13.61k Ohms
25°C (77°F) Sensor Resistance = 9.12k - 10.88k Ohms
30°C (86°F) Sensor Resistance = 7.37k - 8.75k Ohms
40°C (104°F) Sensor Resistance = 4.90k - 5.75k Ohms
50°C (122°F) Sensor Resistance = 3.33k - 3.88k Ohms
Does the Ambient Temperature Sensor resistance measure between the min/max
specifications?
All
Yes
→ Go To 2
No
→ Replace the Ambient Temperature Sensor in accordance with the
Service Information. NOTE: After any repair for an Ambient
Temperature Sensor problem, the vehicle must be driven for more
than 2 minutes to update the display.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the Compass/Temperature Mirror harness connector.
Measure the resistance of the Signal circuit between the Ambient Temperature
Sensor connector and the Compass/Temperature Mirror connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Ambient Temperature Sensor Signal circuit for an
open. NOTE: After any repair for an Ambient Temperature Sensor
problem, thee vehicle must be driven for more than 2 minutes to
update the display.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
125
COMPASS/MINI-TRIP COMPUTER
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the Compass/Temperature Mirror harness connector.
Measure the resistance between ground and the Ambient Temperature Sensor Signal
circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Ambient Temperature Sensor Signal circuit for a short
to ground. NOTE: After any repair for an Ambient Temperature
Sensor problem, the vehicle must be driven for more than 2
minutes to update the display.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the Compass/Temperature Mirror harness connector.
Measure the resistance of the Sensor Ground circuit between the Ambient Temper-
ature Sensor connector and the Compass/Temperature Mirror connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Ambient Temperature Sensor Ground circuit for an
open. NOTE: After any repair for an Ambient Temperature Sensor
problem, the vehicle must be driven for more than 2 minutes to
update the display.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Compass/Temperature Mirror in accordance with the
Service Information. NOTE: After any repair for an Ambient
Temperature Sensor problem, the vehicle must be driven for more
than 2 minutes to update the display.
Perform BODY VERIFICATION TEST - VER 1.
126
COMPASS/MINI-TRIP COMPUTER
*TEMPERATURE DISPLAY INACCURATE OR INOPERATIVE —
Continued
Symptom:
*REAR WINDOW DEFOGGER INOPERATIVE
POSSIBLE CAUSES
REAR WINDOW DEFOGGER GROUND CKT
REAR WINDOW DEFOGGER GRID OPEN
REAR WINDOW DEFOGGER RELAY OUTPUT OPEN
FUSED IGNITION SWITCH OUTPUT (RUN) OPEN
FUSED B(+) CKT OPEN
RELAY COIL
RELAY CONTACTS
REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT OPEN
REAR WINDOW DEFOGGER SWITCH SENSE CKT OPEN
REAR WINDOW DEFOGGER SWITCH SENSE CKT SHORTED TO GROUND
REAR WINDOW DEFOGGER SWITCH SENSE CKT SHORTED TO VOLTAGE
REAR WINDOW DEFOGGER SWITCH
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Toggle the Rear Defogger switch and listen to the Rear Window Defogger Relay in the
PDC.
Does the relay click when the switch is pressed?
All
Yes
→ Go To 2
No
→ Go To 6
2
Turn the ignition off.
Open the tailgate.
Measure resistance between ground and the Rear Window Defogger Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Repair the Rear Window Defogger Ground Circuit for an open
condition.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition on.
Turn the Rear Window Defogger on.
Using a 12-volt test light connected to ground, check the Rear Window Defogger
Relay Output circuit at the defogger grid.
Does the test light illuminate brightly?
All
Yes
→ Repair the open in the Rear Window Defogger Grid.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
127
ELECTRICALLY HEATED SYSTEMS
TEST
ACTION
APPLICABILITY
4
Remove the Rear Window Defogger Relay.
Turn the ignition on.
Measure voltage of the Fused B+ Circuit in the Rear Window Defogger Relay
connector.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 5
No
→ Repair the open Fused B+ Circuit from PDC fuse #2.
Perform BODY VERIFICATION TEST - VER 1.
5
Remove the Rear Window Defogger Relay.
Install a known good relay in the Rear Window Defogger Relay connector.
Turn the ignition on.
Check the Rear Window Defogger for proper operation.
Does the system operate normally?
All
Yes
→ Replace the original Rear Window Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Rear Window Defogger Relay Output Circuit for an
open condition.
Perform BODY VERIFICATION TEST - VER 1.
6
Remove the Rear Window Defogger Relay from the PDC.
Turn the ignition switch On.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch
Output circuit at the relay.
Does the test light illuminate brightly?
All
Yes
→ Go To 7
No
→ Repair the open Fused Ignition Switch Output circuit from PDC
fuse #7
Perform BODY VERIFICATION TEST - VER 1.
7
Install a known good relay in the Rear Window Defogger Relay.
Turn the ignition on.
Check the Rear Window Defogger for proper operation.
Does the system operate normally?
All
Yes
→ Replace the original Rear Window Defogger Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 8
8
Turn the ignition off.
Remove the Rear Window Defogger Relay from the PDC.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the Rear Window Defogger Relay Control circuit between
the Instrument Cluster C2 connector and the PDC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the Rear Window Defogger Relay Control Circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
128
ELECTRICALLY HEATED SYSTEMS
*REAR WINDOW DEFOGGER INOPERATIVE —
Continued
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