Dodge Ram 2004 Service Manual page 380

HEATING & A/C
A/C SWITCH FAULT (STORED) —
TEST
1 NOTE: Active DTCs must be resolved before diagnosing stored DTCs.
NOTE: Anytime a DTC becomes active, or a Cooldown Test fault message,
Actuator Circuit Test fault message, or Door Recalibration fault message is
displayed, proceed to the conclusion question.
Turn the ignition on.
Turn the mode select control to the panel position.
Verify that the blower motor operates correctly in all speeds. Diagnose and repair all
blower related faults before proceeding with this test.
For vehicles that are not equipped with A/C, skip the next 6 steps of this procedure.
Turn the blower control to the low speed position.
Make sure that the A/C switch is turned off (status indicator not illuminated).
Turn the blower control to the off position.
Start the engine.
Turn the blower control to the high speed position.
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.
With the DRBIII in HVAC, System Tests, actuate the AC Cooldown Test. Allow one
minute for test to complete.
If not done previously, start the engine.
Turn the blower control to the low speed position.
Set the blend/driver blend (dual-zone) control to the full cold position.
If equipped, set the passenger blend control to the full cold position.
Monitor the DRBIII for active HVAC DTCs during the following test steps.
If equipped, press the A/C switch on, wait 30 seconds, and then press it off.
On Dual-Zone systems, press the MAX switch on, wait 30 seconds, and then press it
off.
If equipped, press the EBL switch on, wait 30 seconds, and then press it off.
Move the blend/driver blend (dual-zone) control from full cold to full hot, wait 30
seconds, and then move it back to full cold.
If equipped, move the passenger blend control from full cold to full hot, wait 30
seconds, and then moved it back to full cold.
Turn the mode select control to the defrost position, wait 30 seconds, and then turn
it to the panel position (dual-zone) or MAX panel position (single-zone).
With the DRBIII in HVAC, System Tests, actuate the Actuator Circuit Test.
With the DRBIII in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII display any HVAC DTCs or System Test fault messages?
Yes → Return to the symptom list and choose the symptom(s).
→ No problem found at this time.
No
Continued
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
366
APPLICABILITY
All