Instrument Cluster; Ambient Temp Sensor Open/Short To Battery - Mercedes-Benz Sprinter 2003 Manual

Symptom:

AMBIENT TEMP SENSOR OPEN/SHORT TO BATTERY

AMBIENT TEMPERATURE SENSOR SIGNAL (+) CIRCUIT SHORT TO VOLTAGE
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR SIGNAL RETURN CIRCUIT OPEN
AMBIENT TEMPERATURE SENSOR SIGNAL (+) CIRCUIT OPEN

INSTRUMENT CLUSTER

TEST
1 Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the voltage between the Ambient Temperature Sensor Signal (+) circuit and
ground.
Is the voltage above 0.2 volts?
Yes → Repair the Ambient Temperature Sensor Signal (+) circuit for a
No
2 Disconnect the Ambient Temperature Sensor harness connector.
Connect a jumper wire between the Ambient Temperature Sensor Signal (+) and
Ambient Temperature Sensor Signal Return circuit.
Turn the ignition on, with the DRBIII , read DTCs.
Does the DRBIII display Ambient Temperature Sensor Short to Ground?
Yes → Replace the Ambient Temperature Sensor.
No
3 Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the Ambient Temperature Sensor Signal Return circuit
between the Instrument Cluster C1 harness connector and the Ambient Temperature
Sensor harness connector.
Is the resistance above 10 ohms?
Yes → Repair the Ambient Temperature Sensor Signal Return circuit for
No
POSSIBLE CAUSES
ACTION
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
→ Go To 2
Perform BODY VERIFICATION TEST - VER 1.
→ Go To 3
an open.
Perform BODY VERIFICATION TEST - VER 1.
→ Go To 4
INSTRUMENT CLUSTER
177
APPLICABILITY
All
All
All