Dodge Durango (HB). Manual — part 1527
U0019–CAN B BUS (ATC) (CONTINUED)
For the Automatic Temperature Control (ATC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
If the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage, or shorted to ground.
Possible Causes
ACTIVE U0019 CAN B BUS DTC IN FRONT CONTROL MODULE
(D55) CAN B BUS (+) CIRCUIT OPEN
(D54) CAN B BUS (-) CIRCUIT OPEN
A/C HEATER CONTROL
Diagnostic Test
1.
VERIFY DTC U0019–CAN B BUS IS ACTIVE
Turn the ignition on.
With the scan tool, read HVAC DTCs.
Does the scan tool display active: U0019–CAN B BUS?
Yes
>> Go To 2
No
>> If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for
chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken,
bent, pushed out, spread, corroded, or contaminated terminals.
Perform BODY VERIFICATION TEST – VER 1.
2.
CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
With the scan tool, read Front Control Module (FCM) DTCs
Does the scan tool display any active CAN B BUS related DTCs?
Yes
>> Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES -
DIAGNOSIS AND TESTING)
No
>> Go To 3
HB
HVAC - ELECTRICAL DIAGNOSTICS
24 - 301
U0019–CAN B BUS (ATC) (CONTINUED)
3.
CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the Front Control Module (FCM) C1 harness connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between
the Front Control Module C1 harness connector and the A/C Heater
Control C1 harness connector.
Is the resistance below 2.0 ohms?
Yes
>> Go To 4
No
>> Repair the (D55) CAN B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4.
CHECK (D54) CAN B BUS (–) CIRCUIT FOR AN OPEN
Measure the resistance of the (D54) CAN B Bus (–) circuit between
the Front Control Module C1 connector and the A/C Heater Control C1
harness connector.
Is the resistance below 2.0 ohms?
Yes
>> Replace the A/C Heater Control in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the (D54) CAN B Bus (–) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
24 - 302
HVAC - ELECTRICAL DIAGNOSTICS
HB
U0019–CAN B BUS (MTC)
HB
HVAC - ELECTRICAL DIAGNOSTICS
24 - 303
U0019–CAN B BUS (MTC) (CONTINUED)
For the Manual Temperature Control (MTC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - SCHE-
MATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
If the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage, or shorted to ground.
Possible Causes
ACTIVE U0019 CAN B BUS DTC IN FRONT CONTROL MODULE
(D55) CAN B BUS (+) CIRCUIT OPEN
(D54) CAN B BUS (-) CIRCUIT OPEN
A/C HEATER CONTROL
Diagnostic Test
1.
VERIFY DTC U0019–CAN B BUS IS ACTIVE
Turn the ignition on.
With the scan tool, read HVAC DTCs.
Does the scan tool display active: U0019–CAN B BUS?
Yes
>> Go To 2
No
>> If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for
chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken,
bent, pushed out, spread, corroded, or contaminated terminals.
Perform BODY VERIFICATION TEST – VER 1.
2.
CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
With the scan tool, read Front Control Module (FCM) DTCs
Does the scan tool display any active CAN B BUS related DTCs?
Yes
>> Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES -
DIAGNOSIS AND TESTING)
No
>> Go To 3
24 - 304
HVAC - ELECTRICAL DIAGNOSTICS
HB
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