Dodge Sprinter. Manual — part 397
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 1.
The approximate resistance should be 1.4 ohms.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 3.
The approximate resistance should be 0.8 ohms.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 4.
The approximate resistance should be 1.6 ohms.
Is the resistance as specified for each circuit?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
145
HEATING & A/C
BLOWER STAGE 1 HIGH OR OPEN (ACTIVE) —
Continued
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 BLOCK
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove and inspect the Blower Motor Fuse, and replace it if necessary.
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 DRBIII
t, 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 DRBIII
t, verify that the ambient temperature is above 59°F (15°C), the
refrigerant pressure is between 29 and 348 PSI (2 and 24 bar), the evaporator
temperature is above 36.5°F (2.5°C), and the coolant temperature is above 158°F
(70°C).
With the DRBIII
t in Automatic Temperature Control (ATC), select System Tests and
select ATC Function Test. When the ATC Function Test is complete, proceed as
follows:
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: BLOWER STAGE ONE SHORTED LOW?
All
Yes
→ Go To 2
No
→ Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short to ground condition.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
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
Yes
→ Go To 3
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation. Remove and inspect the Blower Motor Fuse, and replace
it if necessary.
Perform BODY VERIFICATION TEST - VER 1.
146
HEATING & A/C
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 (ATC) C2 harness connector.
Measure the resistance between ground and each of the Blower Motor Driver circuits
(Low, M1, M2, High).
Is the resistance below 10k ohms on any of the circuits?
All
Yes
→ Repair each circuit with a resistance below 10k ohms for a short
to ground. Remove and inspect the Blower Motor Fuse, and
replace it if necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Remove the Blower Motor Fuse.
Disconnect the Automatic Temperature Control (ATC) C2 harness connector.
Measure the resistance between ground and the Fused B+ circuit.
Is the resistance below 10k ohms?
All
Yes
→ Repair the Fused B+ circuit for a short to Ground. Remove and
inspect the Blower Motor Fuse, and replace it if necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 1.
The approximate resistance should be 1.4 ohms.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 3.
The approximate resistance should be 0.8 ohms.
Measure the resistance between Blower Motor Resistor Block cavity 2 and cavity 4.
The approximate resistance should be 1.6 ohms.
Is the resistance as specified for each circuit?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information. Remove and inspect the Blower
Motor Fuse, and replace it if necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information. Remove and inspect the Blower Motor Fuse,
and replace it if necessary.
Perform BODY VERIFICATION TEST - VER 1.
147
HEATING & A/C
BLOWER STAGE 1 SHORTED LOW (ACTIVE) —
Continued
Symptom:
CABIN HEATER CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
CABIN HEATER OR HEATER BOOSTER CONTROL UNIT
CABIN HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
CABIN HEATER CONTROL CIRCUIT OPEN
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Verify that the Cabin Heater or Heater Booster is switched off.
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Cabin Heater or Heater Booster harness connector.
Connect a 12-volt test light between the Cabin Heater Control circuit and ground.
Turn the ignition on. The test light should operate as follows:
With the Cabin Heater or Heater Booster switched off, the test light should not
illuminate.
Press the Cabin Heater or Heater Booster switch on. The test light should illuminate
brightly.
Does the test light function as specified?
All
Yes, Light Only Illuminates w/Switch On
Replace the Cabin Heater Assembly or the Heater Booster Assem-
bly in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No, Light Illuminates w/Switch Off
No, Light Will Not Illuminate
2
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Cabin Heater or Heater Booster harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the Cabin Heater Control circuit.
Is the voltage above 0.2 volts?
All
Yes
→ Repair the Cabin Heater Control circuit for a short to voltage.
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.
148
HEATING & A/C
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