Dodge Ram. Manual — part 91
Symptom:
MIC-TURN HAZARD SWITCH INPUT CIRCUIT SHORT
POSSIBLE CAUSES
INTERMITTENT CONDITION
MULTIFUNCTION SWITCH
WIPER/TURN/BEAM SELECT SWITCH SENSE CIRCUIT SHORT TO GROUND
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all MIC DTC’s.
Actuate the Hazard Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Turn Hazard Switch Input Circuit Short?
All
Yes
→ Go To 2
No
→ The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Disconnect the Multifunction Switch connector.
Turn the ignition on.
Does the DRBIII
t display Multifunction Switch 5.0 volts?
All
Yes
→ Go To 3
No
→ Replace the Multifunction Switch.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Multifunction Switch connector.
Disconnect the Instrument Cluster C3 connector.
Measure the resistance of the Wiper/Turn/Beam Select Switch Sense circuit to
ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Wiper/Turn/Beam select switch sense circuit..
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
361
EXTERIOR LIGHTING
Symptom List:
A/C SWITCH FAULT (ACTIVE)
CHECKSUM FAILURE (ACTIVE)
DEFOG SWITCH FAULT (ACTIVE)
RECIRC SWITCH FAULT (ACTIVE)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C SWITCH FAULT (ACTIVE).
When Monitored and Set Condition:
A/C SWITCH FAULT (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C on/off switch stays closed for 10 minutes.
CHECKSUM FAILURE (ACTIVE)
When Monitored:
At every power up (five seconds after ignition is on).
Set Condition:
This DTC will set if the calculated check sum does not match the stored
value.
DEFOG SWITCH FAULT (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the EBL switch stays closed for 10 minutes.
RECIRC SWITCH FAULT (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the MAX on/off switch stays closed for 10 minutes.
POSSIBLE CAUSES
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
View repair
All
Repair
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
362
HEATING & A/C
Symptom List:
A/C SWITCH FAULT (STORED)
BACKLIGHT DIMMING RX FAILURE (STORED)
BLEND OVERCURRENT (STORED)
CHECKSUM FAILURE (STORED)
DEFOG SWITCH FAULT (STORED)
ENGINE GAUGE RX FAILURE (STORED)
EVAPORATOR
TEMPERATURE
SENSOR
CIRCUIT
OPEN
(STORED)
EVAPORATOR
TEMPERATURE
SENSOR
CIRCUIT
SHORTED
(STORED)
LOOPBACK TEST FAILURE (STORED)
MODE 1 OVERCURRENT (STORED)
MODE 2 OVERCURRENT (STORED)
PCM COMMUNICATION FAILURE (STORED)
RECIRC OVERCURRENT (STORED)
RECIRC SWITCH FAULT (STORED)
REFRIGERANT PRESS RX FAILURE (STORED)
TX FAILURE (STORED)
VIN RX FAILURE (STORED)
ZONE OVERCURRENT (STORED)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C SWITCH FAULT (STORED).
When Monitored and Set Condition:
A/C SWITCH FAULT (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C on/off switch stays closed for 10 minutes.
BACKLIGHT DIMMING RX FAILURE (STORED)
When Monitored:
With the ignition on.
Set Condition:
If the A/C - Heater Control Module does not receive the dimming function
message from the Instrument Cluster for more than 5 seconds, then the A/C - Heater
Control Module backlighting will default to full brightness and the DTC will set.
BLEND OVERCURRENT (STORED)
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive the Blend
(single-zone) or Passenger Blend (dual-zone) actuator. Only one overcurrent DTC can set
per ignition cycle.
363
HEATING & A/C
CHECKSUM FAILURE (STORED)
When Monitored:
At every power up (five seconds after ignition is on).
Set Condition:
This DTC will set if the calculated check sum does not match the stored
value.
DEFOG SWITCH FAULT (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the EBL switch stays closed for 10 minutes.
ENGINE GAUGE RX FAILURE (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
message from the PCM for more than 5 seconds. This message provides Battery Voltage,
Battery Temperature, and Engine Coolant Temperature.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage above
4.9 volts on the Evaporator Temperature Sensor Signal circuit.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORTED (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage below
0.06 volts on the Evaporator Temperature Sensor Signal circuit.
LOOPBACK TEST FAILURE (STORED)
When Monitored:
When the A/C - Heater Control Module executes an internal loopback
test.
Set Condition:
If the A/C - Heater Control Module fails to send a message, or none of the
expected messages arrive for 5 seconds, an internal loopback test is executed. If the
internal loopback test fails, the DTC will set.
MODE 1 OVERCURRENT (STORED)
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
MODE 2 OVERCURRENT (STORED)
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
364
HEATING & A/C
A/C SWITCH FAULT (STORED) —
Continued
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