Dodge Dakota (R1). Manual — part 54
Symptom:
TX FAILURE (ACTIVE)
When Monitored and Set Condition:
TX FAILURE (ACTIVE)
When Monitored:
When the ignition is on.
Set Condition:
This DTC will set if the A/C - Heater Control Module is unable to send a
message.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE HVAC MODULE
CHECK FOR ADDITIONAL HVAC DTCS
ATTEMPT TO COMMUNICATE WITH THE PCM AND CTM
A/C - HEATER CONTROL MODULE
INTERMITTENT WIRING PROBLEM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the HVAC Module.
Was the DRBIII
t able to I/D or communicate with the HVAC Module?
All
Yes
→
No
→
Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display additional HVAC DTCs?
All
Yes
→
Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the PCM.
With the DRBIII
t, attempt to communicate with the CTM.
Was the DRBIII
t able to I/D or communicate with the PCM and the CTM?
All
Yes
→
No
→
Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
213
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition on.
With the DRBIII
t, erase HVAC DTCs.
Cycle the ignition switch and wait approximately 1 minute.
With the DRBIII
t, read HVAC DTC’s.
Did this DTC reset?
All
Yes
→
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors to help isolate a possible intermittent
wiring condition.
Perform BODY VERIFICATION TEST - VER 1.
214
HEATING & A/C
TX FAILURE (ACTIVE) —
Continued
Symptom:
*A/C - HEATER CONTROL ILLUMINATION INOPERATIVE
POSSIBLE CAUSES
INOPERATIVE BULB(S)
PANEL LAMPS FEED CIRCUIT OPEN
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove the inoperative bulb(s) from the A/C - Heater Control Module.
NOTE: If necessary, hold the bulb in front of a lamp to see the filament.
Inspect the bulb(s).
Is each inoperative bulb Ok?
All
Yes
→
No
→
Replace the inoperative bulb(s).
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Turn the Headlamp switch on.
Rotate the Cargo Dome switch to the full brightness setting.
Measure the voltage of the Panel Lamps Feed circuit.
Is the voltage above 4.9 volts?
All
Yes
→
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair the Panel Lamps Feed circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
215
HEATING & A/C
Symptom:
*BLOWER MOTOR INOPERATIVE
POSSIBLE CAUSES
POWER DISTRIBUTION CENTER FUSE #13
BLOWER MOTOR FEED CIRCUIT SHORTED TO GROUND
FUSED B(+) CIRCUIT SHORTED TO GROUND
BLOWER MOTOR SHORTED TO GROUND
GROUND CIRCUIT OPEN
A/C - HEATER CONTROL MODULE OPEN
BLOWER MOTOR DRIVER CIRCUIT OPEN
RESISTOR-OPEN HI BLOWER MOTOR DRIVER
BLOWER MOTOR COMMON DRIVER CIRCUIT OPEN
BLOWER MOTOR
FUSED B(+) CIRCUIT OPEN
IGNITION SWITCH OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove and inspect Power Distribution Center Fuse #13.
Is the fuse open?
All
Yes
→
No
→
2
Turn the ignition off.
Replace the Power Distribution Center Fuse #13.
Turn the ignition on.
Turn the blower on and operate it in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
All
Yes
→
Check the Blower Motor Feed circuit and the Fused B(+) circuit
for an intermittent short to ground. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
Turn the ignition off.
Disconnect the Blower Motor harness connector.
Measure the resistance between ground and the Blower Motor Feed circuit.
Is the resistance below 10K ohms?
All
Yes
→
Repair the Blower Motor Feed circuit for a short to ground and
replace the fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→
216
HEATING & A/C
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