Chrysler New Yorker. Manual - part 678

TEST SC-4A

CHECKING THE BRAKE SWITCH SENSE

Perform TEST SC-1A Before Proceeding

FIG. 1

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

548

TEST SC-4A

CHECKING THE BRAKE SWITCH SENSE

Perform TEST SC-1A Before Proceeding

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

WHILE OBSERVING

DOES THE DRB

START TEST THE DRB DISPLAY, 

DISPLAY COAST

NO 

REPLACE THE COAST

SC-4A. PRESS THE COAST

SWITCH 

"PRESSED"

SWITCH.* 

SWITCH SEVERAL

OR "RELEASED"?

TIMES. 

YES

WHILE OBSERVING

DOES THE DRB

THE DRB DISPLAY, DISPLAY BRAKE

YES

PERFORM TEST 

PRESS THE BRAKE

SWITCH "PRESSED"

SC-1A

PEDAL SEVERAL

OR "RELEASED"?

CONTINUED. 

TIMES. 

NO 

DISCONNECT THE BRAKE

KEY ON, USING A

SWITCH HARNESS

VOLTMETER, MEASURE

CONNECTOR.** THE VOLTAGE OF 

THE

BRAKE SWITCH 

SEE GENERAL INFO 4.7

SENSE... 

CIRCUIT AT THE

BRAKE SWITCH 

IS THE VOLTAGE

NO 

CONTINUE TEST 

CONNECTOR. 

ABOVE 10.0 VOLTS? 

SC-4A ON THE

NEXT PAGE.

FIG. 1

YES

CONNECT A JUMPER 

BETWEEN THE BRAKE

WITH THE DRB, READ 

DOES THE DRB

YES

REPLACE THE BRAKE

SWITCH SENSE AND

THE BRAKE SWITCH 

DISPLAY BRAKE SW 

SWITCH.* 

GROUND IN BRAKE

INPUT STATUS.

"RELEASED"?

SWITCH CONN.

FIG. 1

NO 

REPAIR THE OPEN 
GROUND CIRCUIT.*

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

549

TEST SC-4A

CONTINUED - CHECKING THE BRAKE SWITCH SENSE

FIG. 1

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

550

TEST SC-4A

CONTINUED - CHECKING THE BRAKE SWITCH SENSE

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

TEST SC-4A

KEY OFF, DISCONNECT 

CONTINUED FROM 

THE POWERTRAIN 

IS ANY TERMINAL 

YES

REPAIR AS 

THE PREVIOUS CONTROL MODULE 

DAMAGED, 

PUSHED NECESSARY.*

PAGE.

HARNESS CONNECTOR.** OUT OR 

MISWIRED?

SEE GENERAL INFO 4.1

NO 

USING AN OHMMETER,

AT PCM CONNECTOR

REPAIR THE BRAKE

MEASURE THE

TO GROUND.

IS THE RESISTANCE 

YES

SWITCH SENSE

RESISTANCE OF THE

BELOW 5.0 OHMS?

CIRCUIT, SHORTED

BRAKE SWITCH SENSE

TO GROUND.* 

CIRCUIT... FIG. 

1

NO 

MEASURE THE BRAKE

USE AN OHMMETER IN 

SWITCH SENSE CKT. 

IS THE RESISTANCE 

YES

REPLACE THE

THE FOLLOWING

FROM THE PCM TO 

BELOW 5.0 OHMS?

POWERTRAIN CONTROL

STEP.

THE BRAKE SWITCH.

MODULE.* 

FIG. 1

NO 

REPAIR THE OPEN 

BRAKE SWITCH SENSE

CIRCUIT. 

BRAKE SWITCH TO 

PCM.*

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

551