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