Dodge Ram. Manual — part 100
Symptom:
*A/C - HEATER CONTROL ILLUMINATION INOPERATIVE
POSSIBLE CAUSES
CHECK FOR INSTRUMENT CLUSTER (MIC) DTCS
INOPERATIVE BULB(S)
A/C - HEATER CONTROL MODULE
PANEL LAMPS DRIVER CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in Body, Electro/Mech Cluster (MIC), read DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the Instrument Cluster category for the related symp-
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the Headlamp switch on.
Rotate the Cargo Dome switch to the full brightness setting.
CAUTION: The test light must illuminate brightly. Compare the brightness
to that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the Panel Lamps Driver
circuit in the A/C-Heater Control Module C1 harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Go To 4
3
For Dual-Zone HVAC systems, proceed directly to the conclusion of this test and
answer Yes to the question. For Single-Zone HVAC systems, proceed as follows:
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
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the inoperative bulb(s).
Perform BODY VERIFICATION TEST - VER 1.
397
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the Panel Lamps Driver circuit between the A/C - Heater
Control C1 harness connector and the Instrument Cluster C3 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Panel Lamps Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
398
HEATING & A/C
*A/C - HEATER CONTROL ILLUMINATION INOPERATIVE —
Continued
Symptom List:
*A/C STATUS INDICATOR FLASHING
*EBL STATUS INDICATOR FLASHING
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be *A/C STATUS INDICATOR
FLASHING.
POSSIBLE CAUSES
AC COOLDOWN TEST NEEDS TO BE RUN
HVAC DOOR RECALIBRATION NEEDS TO BE RUN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Which status indicator is flashing on the A/C-Heater Control Module?
All
A/C Status Indicator
Go To
2
EBL Status Indicator
Go To
3
2
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
NOTE: The A/C status indicator can flash at two different rates, twice per
second (fast rate) when the control is indicating that the AC Cooldown Test
needs to be run, and once every two seconds (slow rate) when the AC
Cooldown Test is in progress.
NOTE: When the A/C status indicator is flashing, it will not indicate A/C
operating status. However, the A/C switch will continue to function nor-
mally.
NOTE: When the A/C status indicator is flashing, the EBL status indicator
will not function. However, the EBL switch will continue to function
normally.
Start the engine.
Turn the Blower control to the High position.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test. Allow one
minute for test to complete.
Does the DRBIII
t display: Cooldown Test Passed?
All
Yes
→ Test Complete.
No
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
399
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
NOTE: The EBL status indicator can flash at two different rates, twice per
second (fast rate) when the control is indicating that the HVAC Door Recal
needs to be run, and once every two seconds (slow rate) when the HVAC
Door Recal is in progress.
NOTE: When the EBL status indicator is flashing, it will not indicate EBL
operating status. However, the EBL switch will continue to function nor-
mally.
NOTE: When the EBL status indicator is flashing, the A/C status indicator
will not function. However, the A/C switch will continue to function nor-
mally.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display: Recalibration Test Passed?
All
Yes
→ Test Complete.
No
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
400
HEATING & A/C
*A/C STATUS INDICATOR FLASHING —
Continued
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