2006 MERCEDES-BENZ SPRINTER Service Manual

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Page 153 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual Symptom:
AUX FAN RELAY CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE
GROUND CIRCUIT OPEN
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL

Page 154 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual TEST ACTION APPLICABILITY
4 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Reconnect the Automatic Temperature Control (ATC) C1 harness connector.
Install a substitute rela

Page 155 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual Symptom:
AUX FAN RELAY CONTROL SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
A/C AUXILIARY FAN RELAY
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO GROUND
A/C AUXILIARY FAN RELAY HIGH SIDE CONTRO

Page 156 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual TEST ACTION APPLICABILITY
3 Turn the ignition off.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resist

Page 157 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual Symptom:
BLOWER STAGE 1 HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
BLOWER MOTOR
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK
AUTOMATIC T

Symptom:
BLOWER STAGE 1 HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
BLOWER MOTOR
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Blower Motor harness connector.
Connect a fused jumper wire between Battery (+) and Blower Motor cavity 1.
Connect a jumper wire between ground and Blower Motor cavity 2.
Does the Blower Motor run at full speed?All
Ye s!Go To 2
No!Replace the Blower Motor in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Blower Motor Resistor Block harness connector.
Disconnect the Blower Motor harness connector.
Disconnect the Automatic Temperature Control (ATC) C2 harness connector.
Turn the ignition on.
Measure the voltage of each of the Blower Motor Driver circuits (Low, M1, M2, High).
Is the voltage above 0.2 volts on any of the circuits?All
Ye s!Repair each circuit with voltage above 0.2 volts for a short to
voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Automatic Temperature Control (ATC) C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Disconnect the Blower Motor harness connector.
Measure the resistance of the Blower Motor Driver circuits (Low, M1, M2, High)
between the Automatic Temperature Control (ATC) C2 harness connector and the
Blower Motor Resistor Block harness connector.
Measure the resistance of the Blower Motor High Driver circuit between the
Automatic Temperature Control (ATC) C2 harness connector and the Blower Motor
harness connector.
Is the resistance below 5.0 ohms on each of the circuits?All
Ye s!Go To 4
No!Repair each circuit with a resistance above 5.0 ohms for an open.
Perform BODY VERIFICATION TEST - VER 1.
144
HEATING & A/C

Page 158 of 2305

Page 159 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual Symptom:
BLOWER STAGE 1 SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
BLOWER MOTOR FUSE
BLOWER MOTOR
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO GROUND
FUSED B+ CIRCUIT SHORTED TO GROUND
BLOWER MOTOR RESISTOR BL

Page 160 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Blower Motor Resistor harness connector.
Disconnect the Blower Motor harness connector.
Disconnect the Automatic Temperature Control (

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