fan MERCEDES-BENZ SPRINTER 2006 User Guide

Symptom:
FAN STAGE 1 RELAY CONTROL SHORTED
POSSIBLE CAUSES
FAN STAGE 1 RELAY
FAN STAGE 1 RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO GROUND
FAN STAGE 1 RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
CABIN HEATER CONTROL UNIT
TEST ACTION APPLICABILITY
1WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE HEATER PRE-TEST. ALWAYS PERFORM THE HEATER PRE-TEST
PRIOR TO PERFORMING ANY OTHER TEST FOR THE RESULT TO BE
VALID.
Turn the ignition off.
Install a substitute relay in place of the Fan Stage 1 Relay.
Turn the ignition on.
Verify that the Cabin Heater is switched off.
Set the blend control to the max heat position and the mode control to the floor
position.
With the DRBIIIt, erase the Cabin Heater Module's DTCs.
Start the engine. Allow the engine to idle.
With the DRBIII, monitor for Cabin Heater Module DTCs while performing the
following step.
NOTE: Do not disconnect the vehicle's battery or the heater's main power
supply while the heater is in operation or in run-down mode. Failure to
follow these instructions can result in excess emissions from the heater
during heater operation.
Switch the Cabin Heater on. If necessary, allow the heater to run through at least one
cycle of operation (approximately 10 minutes), and then switch the heater off.
Turn the engine off.
Does the DRBIIItdisplay: FAN STAGE 1 RELAY CONTROL SHORTED?All
Ye s!Go To 2
No!Replace the original Fan Stage 1 Relay in accordance with the
Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
85
CABIN HEATER

TEST ACTION APPLICABILITY
2WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Cabin Heater harness connector.
Remove the substitute Fan Stage 1 Relay from the relay center.
Measure the resistance between ground and the Fan Stage 1 Relay High Side Control
circuit.
Is the resistance below 10K ohms?All
Ye s!Repair the Fan Stage 1 Relay High Side Control circuit for a short
to ground. Reinstall the original Fan Stage 1 Relay.
Perform HEATER VERIFICATION TEST - VER 1.
No!Go To 3
3WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Cabin Heater harness connector.
Remove the Fan Stage 1 Relay from the relay center.
Measure the resistance between the Fan Stage 1 Relay High Side Control circuit and
the Ground circuit (Fan Stage 1 Relay connector terminal 86 and 85).
Is the resistance below 10K ohms?All
Ye s!Repair the Fan Stage 1 Relay High Side Control circuit for a short
to the Ground circuit.
Perform HEATER VERIFICATION TEST - VER 1.
No!Replace the Cabin Heater Assembly in accordance with the
Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
86
CABIN HEATER
FAN STAGE 1 RELAY CONTROL SHORTED ÐContinued

Symptom List:
A/C COMPRESSOR CONTROL HIGH OR OPEN (STORED)
A/C COMPRESSOR CONTROL SHORTED LOW (STORED)
AIR OUTLET TEMP SENSOR HIGH OR OPEN (STORED)
AIR OUTLET TEMP SENSOR SHORTED LOW (STORED)
AUX FAN RELAY CONTROL HIGH OR OPEN (STORED)
AUX FAN RELAY CONTROL SHORTED LOW (STORED)
BLOWER STAGE 1 HIGH OR OPEN (STORED)
BLOWER STAGE 1 SHORTED LOW (STORED)
CABIN HEATER CONTROL HIGH OR OPEN (STORED)
CABIN HEATER CONTROL SHORTED LOW (STORED)
CIRC PUMP CONTROL HIGH OR OPEN (STORED)
CIRC PUMP CONTROL SHORTED LOW (STORED)
EVAP TEMP SENSOR HIGH OR OPEN (STORED)
EVAP TEMP SENSOR SHORTED LOW (STORED)
NO COMMUNICATION BUS (STORED)
NO COMMUNICATION WITH ECM (STORED)
NO COMMUNICATION WITH IC (STORED)
RECIRC AIR SOLENOID CONTROL HIGH OR OPEN (STORED)
RECIRC AIR SOLENOID CONTROL SHORTED LOW (STORED)
REFRIG PRESS SENSOR HIGH OR OPEN (STORED)
REFRIG PRESS SENSOR SHORTED LOW (STORED)
WATER CYCLE VALVE CONTROL HIGH OR OPEN (STORED)
WATER CYCLE VALVE CONTROL SHORTED LOW (STORED)
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C COMPRESSOR CONTROL
HIGH OR OPEN (STORED).
When Monitored and Set Condition:
NO COMMUNICATION BUS (STORED)
When Monitored: With the ignition on.
Set Condition: This DTC will set if the Automatic Temperature Control (ATC) fails to
receive all module messages.
NO COMMUNICATION WITH ECM (STORED)
When Monitored: With the ignition on.
Set Condition: This DTC will set if the Automatic Temperature Control (ATC) fails to
receive all messages from the ECM.
130
HEATING & A/C

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 CIRCUIT OPEN
A/C AUXILIARY FAN RELAY
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the voltage of the A/C Auxiliary Fan Relay High Side Control circuit.
Is the voltage above 0.2 volts?All
Ye s!Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 2
2 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Measure the resistance between ground and the Ground circuit in the relay center
(A/C Auxiliary Fan Relay connector terminal 85).
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance of the A/C Auxiliary Fan Relay High Side Control circuit
between the Automatic Temperature Control (ATC) C1 harness connector and the
relay center (A/C Auxiliary Fan Relay connector terminal 86).
Is the resistance below 5.0 ohms?All
Ye s!Go To 4
No!Repair the A/C Auxiliary Fan Relay High Side Control circuit for
an open.
Perform BODY VERIFICATION TEST - VER 1.
140
HEATING & A/C

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 relay in place of the A/C Auxiliary Fan Relay.
Turn the ignition on.
With the DRBIIIt, erase Automatic Temperature Control DTCs.
Turn the ignition off, wait 5 seconds, then turn the ignition on.
With the DRBIIIt, read Automatic Temperature Control DTCs.
Does the DRBIIItdisplay: AUX FAN RELAY CONTROL HIGH OR OPEN?All
Ye s!Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information. Reinstall the original A/C Auxiliary
Fan Relay.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the original A/C Auxiliary Fan Relay in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
141
HEATING & A/C
AUX FAN RELAY CONTROL HIGH OR OPEN (ACTIVE) ÐContinued

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 CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CKT SHORTED TO SENSOR GROUND CKT
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Install a substitute relay in place of the A/C Auxiliary Fan Relay.
NOTE: All of the following criteria must be met in order to successfully run
the ATC Function Test.
Place the shift lever in Park.
Turn the ignition on.
With the DRBIIIt, record and erase ATC DTC's.
Start the engine. Allow the engine to reach normal operating temperature.
Set the blower to high speed.
Press the Air Conditioning switch On.
With the DRBIIIt, verify that the ambient temperature is above 59ÉF (15ÉC), the
refrigerant pressure is between 29 and 348 PSI (2 and 24 bar), the evaporator
temperature is above 36.5ÉF (2.5ÉC), and the coolant temperature is above 158ÉF
(70ÉC).
With the DRBIIItin Automatic Temperature Control (ATC), select System Tests and
select ATC Function Test. When the ATC Function Test is complete, proceed as
follows:
With the DRBIIIt, read the active ATC DTCs.
Does the DRBIIItdisplay: AUX FAN RELAY CONTROL SHORTED LOW?All
Ye s!Go To 2
No!Replace the original A/C Auxiliary Fan Relay in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Remove the substitute A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the A/C Auxiliary Fan Relay High Side
Control circuit.
Is the resistance below 10K ohms?All
Ye s!Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to ground. Reinstall the original A/C Auxiliary Fan Relay.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
142
HEATING & A/C

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 resistance between the A/C Auxiliary Fan Relay High Side Control
circuit and the Ground circuit in the Automatic Temperature Control (ATC) C1
harness connector.
Is the resistance below 10K ohms?All
Ye s!Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
4 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 resistance between the A/C Auxiliary Fan Relay High Side Control
circuit and the Sensor Ground circuit in the Automatic Temperature Control (ATC)
C1 harness connector.
Is the resistance below 10K ohms?All
Ye s!Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
143
HEATING & A/C
AUX FAN RELAY CONTROL SHORTED LOW (ACTIVE) ÐContinued

9.0 CONNECTOR PINOUTS
A/C AUXILIARY FANCAV CIRCUIT FUNCTION
1 14DG/BK A/C AUXILIARY FAN RELAY OUTPUT
2 14BR GROUND
AIR OUTLET TEMPERATURE SENSORCAV CIRCUIT FUNCTION
1 18BR/GY AIR OUTLET TEMPERATURE SENSOR SIGNAL
2 18BR/BL SENSOR GROUND
AIRBAG CONTROL MODULE - YELLOWCAV CIRCUIT FUNCTION
1 20BL DRIVER SEAT BELT TENSIONER LINE 2
2 20BR/YL DRIVER SEAT BELT TENSIONER LINE 1
3 20BL PASSENGER SEAT BELT TENSIONER LINE 2
4 20BR PASSENGER SEAT BELT TENSIONER LINE 1
5 20BK FUSED IGNITION SWITCH OUTPUT (RUN-START)
6 20BR GROUND
7 20YL AIRBAG WARNING INDICATOR DRIVER
8- -
9 20BK/RD K-ACM
10 20DG DRIVER AIRBAG SQUIB 1 LINE 2
11 20VT DRIVER AIRBAG SQUIB 1 LINE 1
12 - -
13 20BL/DG PASSENGER AIRBAG SQUIB 1 LINE 2
14 20BR/DG PASSENGER AIRBAG SQUIB 1 LINE 1
15 - -
16 - -
17 - -
18 - -
19 - -
20 20DG ENHANCED ACCIDENT REPORT DRIVER
21 -
22 -
23 -
24 -
25 -
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257
CONNECTOR PINOUTS

AUTOMATIC TEMPERATURE CONTROL MODULE C1 - BROWNCAV CIRCUIT FUNCTION
1 16RD/BL FUSED B(+)
2 18DG/RD (REST SYSTEM) CIRCULATION PUMP CONTROL
3 18BK/RD A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL
4 16BL/YL HEATER BOOSTER MODE
5 18BR/VT WATER CYCLE VALVE CONTROL
6 20RD/BL 5 VOLT SUPPLY
7 18BK/YL K-IC/ATC/HBM/CHM
8 16RD/YL/WT FUSED D(+) RELAY OUTPUT
8 20BL/VT D(+) RELAY CONTROL
9 16GY/DG/RD LAMP DRIVER
10 16BL CABIN HEATER CONTROL
11 16BK/BL/WT RECIRCULATED AIR SOLENOID VALVE CONTROL
12 16BL/DG A/C COMPRESSOR CLUTCH CONTROL
13 18BR/DG EVAPORATOR TEMPERATURE SENSOR SIGNAL
14 - -
15 16BR GROUND
16 18BR/GY AIR OUTLET TEMPERATURE SENSOR SIGNAL
17 20DG/WT CAN C BUS (+)
18 18BR/BL SENSOR GROUND
19 20BR/RD REFRIGERANT PRESSURE SENSOR FEEDBACK
20 20DG CAN C BUS (-)
21 16BK/BL/DG FUSED IGNITION SWITCH OUTPUT
AUTOMATIC TEMPERATURE CONTROL MODULE C2CAV CIRCUIT FUNCTION
1 14BK/VT FAN STAGE 1 RELAY OUTPUT
1 12YL BLOWER MOTOR LOW DRIVER
2 12WT BLOWER MOTOR HIGH DRIVER
3 12WT/BK BLOWER MOTOR M1 DRIVER
4 12YL/BK BLOWER MOTOR M2 DRIVER
5 12RD/BL FUSED B(+)
AUXILIARY HEATER CONTROLCAV CIRCUIT FUNCTION
1 16GY/DG/RD LAMP DRIVER
2- -
3 16RD/YL FUSED B(+)
4- -
5- -
6- -
7 16YL CABIN HEATER CONTROL
8- -
9- -
10 16BR GROUND
BLOWER MOTOR RESISTOR BLOCKCAV CIRCUIT FUNCTION
1 12YL/BK BLOWER MOTOR M2 DRIVER
2 12YL BLOWER MOTOR LOW DRIVER
3 12WT/BK BLOWER MOTOR M1 DRIVER
4 12DG BLOWER MOTOR HIGH DRIVER
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259
CONNECTOR PINOUTS

A/C AUXILIARY FAN RELAY (RELAY BLOCK)CAV CIRCUIT FUNCTION
30 14BL/YL FUSED B(+)
85 18BR GROUND
86 18BK/RD A/C AUXILIARY FAN RELAY CONTROL
87 14DG/BK A/C AUXILIARY FAN RELAY OUTPUT
87A --
CIRCULATION PUMP RELAY-CABIN HEATER MODULE (RELAY BLOCK)CAV CIRCUIT FUNCTION
30 18DG/BK CIRCULATION PUMP RELAY OUTPUT
85 16BR GROUND
86 16BL/YL CIRCULATION PUMP RELAY HIGH SIDE CONTROL
87 16RD/BL FUSED B(+)
87A 16BK/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
D+ RELAY NO. 2 (RELAY BLOCK)CAV CIRCUIT FUNCTION
30 14RD FUSED B(+)
85 16RD/BK FUSED D(+) RELAY NO. 1 OUTPUT
86 16BR GROUND
87 14BL/YL D(+) RELAY NO. 2 OUTPUT
87A --
FAN STAGE 1 RELAY (RELAY BLOCK)CAV CIRCUIT FUNCTION
30 14BK/VT FAN STAGE 1 RELAY OUTPUT
85 16BR GROUND
86 16BL/YL FAN STAGE 1 RELAY HIGH SIDE CONTROL
87 16RD/WT FUSED B(+)
87A --
OPTIONAL EQUIPMENT RELAY (RELAY BLOCK)CAV CIRCUIT FUNCTION
30 10RD FUSED B(+)
85 16BR GROUND
86 16BK/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
87 10BK OPTIONAL EQUIPMENT RELAY OUTPUT
87A --
REMOTE KEYLESS ENTRY ANTENNACAV CIRCUIT FUNCTION
1 20BR RKE ANTENNA
3 - GROUND
SEAT BELT SWITCHCAV CIRCUIT FUNCTION
1 16BR GROUND
2 20YL/RD SEAT BELT SWITCH SIGNAL
3- -
4- -
5- -
6- -
7- -
8- -
9- -
10 - -
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284
CONNECTOR PINOUTS