Chrysler New Yorker. Manual - part 451

TEST 3A

CONTINUED - REPAIRING “A/C CONTROL EBL SWITCH FAILURE” TROUBLE CODE

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TEST 3A

CONTINUED - REPAIRING “A/C CONTROL EBL SWITCH FAILURE” TROUBLE CODE

*Perform Verification TEST VER-2A.

**Check connectors - Clean / repair as necessary.

TEST 3A 

PRESS AND RELEASE

CONTINUED FROM THE REAR 

DEFOGGER DOES 

THE BUTTON 

YES

REPLACE THE

THE PREVIOUS 

BUTTON SEVERAL

SEEM TO STICK AT 

A/C-HEATER CONTROL

PAGE.

TIMES. TIMES? HEAD.* 

NO 

WITH THE BUTTON 

WITH THE DRB READ 

RELEASED IS THE

NO 

REPLACE THE

THE "MODE SWITCH VOLTAGE

A/C-HEATER 

CONTROL

MUX" VOLTAGE. 

APPROXIMATELY 4.2

HEAD.* 

VOLTS? 

YES

PRESS AND HOLD THE

THE SWITCH IS 

REAR DEFOGGER 

OBSERVE THE "MODE

IS THE VOLTAGE

YES

OPERATING PROPERLY 

SWITCH ON THE

SWITCH MUX" 

APPROXIMATELY 0.25 

AT THIS TIME.

A/C-HEATER CONTROL

VOLTAGE. 

VOLTS? 

RETRY THE SYSTEM 

HEAD.

AND RECHECK DTC’s. 

NO 

REPLACE THE

A/C-HEATER CONTROL

HEAD.* 

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403

TEST 4A

REPAIRING

(

A/C CONTROL BLEND DOOR INPUT OPEN OR SHORTED TO GROUND

(

TROUBLE CODE

Perform TEST 1B Before Proceeding

FIG. 1

FIG. 2

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TEST 4A

REPAIRING

(

A/C CONTROL BLEND DOOR INPUT OPEN OR SHORTED TO GROUND

(

TROUBLE CODE

Perform TEST 1B Before Proceeding

*Perform Verification TEST VER-2A.

**Check connectors - Clean / repair as necessary.

TURN THE IGNITION 

ON.

START TEST 4A.

ERASE THE TROUBLE

CODE.

DISCONNECT THE

USING A VOLTMETER, 

REPAIR THE OPEN 

A/C-HEATER "C1" 

MEASURE THE FUSED

IS THE VOLTAGE

NO 

FUSED IGNITION 

HARNESS CONNECTOR.** 

IGNITION SWITCH 

ABOVE 10.0 VOLTS? 

SWITCH OUTPUT 

OUTPUT CIRCUIT. 

CIRCUIT.*

FIG. 1

FIG. 1

YES

KEY OFF. DISCONNECT 

USING AN OHMMETER,

REPAIR THE

THE BODY CONTROL

MEASURE BETWEEN

IS THE RESISTANCE 

YES

TEMPERATURE SELECT 

MODULE C2 HARNESS

GROUND AND THE TEMP 

BELOW 50.0 OHMS?

SIGNAL CIRCUIT FOR

CONNECTOR.** 

SELECT SIGNAL CKT. 

A SHORT TO 

SEE GENERAL INFO 4.0

FIG. 1

GROUND.* 

NO 

WITH AN OHMMETER,

REPAIR THE

MEASURE BETWEEN

IS THE RESISTANCE 

YES

TEMPERATURE SELECT 

SENSOR GROUND CKT

BELOW 5.0 OHMS?

SIGNAL CIRCUIT FOR

AND THE TEMP SELECT 

A SHORT TO SENSOR 

SIGNAL CKT. FIG. 1

GROUND CIRCUIT.*

NO 

CONNECT A JUMPER USING AN 

OHMMETER,

WIRE BETWEEN THE

MEASURE BETWEEN

IS THE RESISTANCE 

NO 

REPAIR THE OPEN 

TEMPERATURE SELECT GROUND 

AND THE

BELOW 5.0 OHMS?

TEMPERATURE SELECT 

SIGNAL CKT AND

TEMP SELECT SIGNAL 

SIGNAL CIRCUIT.*

GROUND. FIG. 2

CKT. FIG. 1

YES

REMOVE THE JUMPER 

WIRE. RECONNECT

TURN THE IGNITION 

THE A/C-HEATER ON.

CONTROL "C1" 

HARNESS CONNECTOR. 

USING A VOLTMETER, 

MOVE THE

DOES THE VOLTAGE

MEASURE THE

TEMPERATURE

CHANGE SMOOTHLY FROM  NO 

REPLACE THE

TEMPERATURE SELECT CONTROL FROM 

COLD  APPROXIMATELY 1.0V A/C-HEATER 

CONTROL

SIG CKT (CAV 12). 

TO HOT. 

(FULL COLD) TO 10.0 

HEAD.* 

FIG. 2

VOLTS (FULL HOT)?

YES

REPLACE THE BODY 
CONTROL MODULE.* 

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405