INSPECTION PROCEDURE 1: When the Ignition Switch is "ON," the A/C does not Operate.: Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?

YES : Repair the leak. Then go to Step 11.

NO: Go to Step 2.
STEP 2. Check for excessive refrigerant.
Q: Is the refrigerant in good condition?

YES : Go to Step 3.

NO: Use the refrigerant recovery station to remove all of the refrigerant, and then calculate the amount of the refrigerant and charge it. Then go to Step 11.

STEP 3. Check the A/C compressor clutch relay continuity.

Follow the table below to check the A/C compressor clutch relay for continuity.

RELAY CHECK

BATTERY VOLTAGE	TESTER CONNECTION	SPECIFIED CONDITION
Not applied	1 - 4	Open circuit
Connect terminal 2 to the positive battery terminal Connect terminal 3 to the negative battery terminal	1 - 4	Less than 2 ohms

Q: Is the A/C compressor clutch relay in good condition?

YES : Go to Step 4.

NO: Replace the A/C compressor clutch relay. Then go to Step 11.

Fig 1: Checking A/C Compressor Clutch Relay Continuity

Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 4. Check the A/C compressor clutch operation.
Connect the battery (+) terminal to the compressor A/C compressor clutch connector terminal 1; < 2.4L engine >/terminal 4; < 3.0L engine >, and ground the battery (-) terminal to the body of the compressor.

Q: Can the sound of the A/C compressor clutch (click) be heard?

YES : Go to Step 5.

NO: Replace the A/C compressor clutch. Then go to Step 11.

Fig 2: Connecting Battery (+) Terminal To Compressor A/C Compressor Clutch Connector Terminal
Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 5. Check the dual pressure switch operation.

Remove the dual pressure switch connector and connect the high/low pressure side terminals located on the harness side as shown in the illustration.
Install a gauge manifold to the high-pressure side service valve of the refrigerant line. (Refer to REFILLING OF OIL IN THE A/C SYSTEM .)

When the high/low pressure sides of the dual pressure switch are at operation pressure (ON) and the resistance is less than 2 ohms between the respective terminals, then the condition is normal. If open loop, replace the switch.

DUAL PRESSURE SWITCH CHECK

ITEM	SWITCH POSITION
ITEM	OFF to ON	ON to OFF
Low-pressure side kPa (psi)	195 - 250 (28.3 - 36.2)	176 - 216 (25.5 - 31.3)
High-pressure side kPa (psi)	2,350 - 2,950 (340.9 - 427.9)	3,140 - 3,340 (455.5 - 484.5)

Q: Is the dual pressure switch operating properly?

YES : Go to Step 6.

NO: Replace the switch. Then go to Step 11.

Fig 3: Checking Dual Pressure Switch

Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 6. Check the A/C switch continuity.

Follow the table below to check the A/C switch for continuity.

A/C SWITCH CHECK

SWITCH POSITION	TESTER CONNECTION (CONNECTOR B)	SPECIFIED CONDITION
OFF	5 - 6	Open circuit
ON	5 - 6	Less than 2 ohms

Q: Is the A/C switch continuity in good condition?

YES : Go to Step 7.

NO: Replace. Then go to Step 11.

Fig 4: Checking A/C Switch Continuity

Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 7. Check the blower switch continuity.

Follow the table below to check the blower switch for continuity.

BLOWER SWITCH CHECK

SWITCH POSITION	TESTER CONNECTION (CONNECTOR A)	SPECIFIED CONDITION
0 (OFF)	1 - 3, 3 - 4, 3 - 5, 3 - 6	Open circuit
1 (LO)	3 - 5	Less than 2 ohms
2 (ML)	1 - 3	Less than 2 ohms
3 (MH)	3 - 6	Less than 2 ohms
4 (HI)	3 - 4	Less than 2 ohms

Q: Is the blower switch continuity in good condition?

YES : Go to Step 8.

NO: Replace. Then go to Step 11.

Fig 5: Checking Blower Switch

Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 8. Check the refrigerant-temperature switch operation.
When the A/C is off, check that there is less than 2 ohms between the refrigerant-temperature switch terminals.

Q: Is the refrigerant-temperature switch in good condition?

YES : Go to Step 9.

NO: If the switch has an open circuit, replace the switch. Then go to Step 11.

Fig 6: Checking Refrigerant-Temperature Switch
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 9. Measure the automatic compressor controller terminal voltage.
Refer to CHECK AT AUTOMATIC COMPRESSOR CONTROLLER TERMINAL .

Q: Is the automatic compressor controller terminal voltage good?

YES : Go to Step 10.

NO: Replace. Then go to Step 11.
STEP 10. Measure the engine control module < M/T >/the powertrain control module < A/T > terminal voltage.
Refer to CHECK AT THE ENGINE CONTROL MODULE (ECU) < M/T > OR POWERTRAIN CONTROL MODULE (PCM) < A/T > < 2.4L ENGINE >

Refer to CHECK AT THE ENGINE CONTROL MODULE (ECU) < M/T > OR POWERTRAIN CONTROL MODULE (PCM) < A/T > < 3.0L ENGINE >

Q: Is the terminal voltage in good condition?

YES : Go to Step 11.

NO: Replace the defroster switch. Then go to Step 11.
STEP 11. Retest the system.
Q: Is the A/C operating properly?

YES : The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .)

NO: Go to Step 1.