Bendix Commercial Vehicle Systems MC-12 MODULATOR CONTROLLER ASSY - Manual (Page 10)

10
START HERE
STATUS LAMP DOES NOT BLINK, COMES
ON AND REMAINS ILLUMINATED
YES
NO
STATUS LAMP COMES ON, BLINKS AND
GOES OUT.
THE SYSTEM IS FUNCTIONING NORMALLY.
MAKE NOTES OF THE PARTS REPLACED OR
REPAIRED AND STEPS TAKEN .
AMBER STATUS LAMP
BLINKS ONCE, THEN GOES OUT
SYSTEM - OK
WITH TRAILER CONNECTED TO
TRACTOR, TURN IGNITION ON, APPLY
TRAILER SERVICE BRAKES AND
OBSERVE STATUS LAMP MOUNTED
ON TRAILER.
NO
DID STATUS LAMP ILLUMINATE?
GO TO SECTION I “STATUS
LAMP TESTING”
ARE STOP LAMPS
ILLUMINATED
YES
TEST FOR POWER TO THE
TRAILER AT 7 PIN CONNECTOR
NO
YES
GO TO SECTION II
“INSPECTION FOR
ILLUMINATED LEDS ”.
Troubleshooting
INITIAL START-UP PROCEDURE
TYPICAL
LOCATIONS
FOR AMBER
STATUS LAMP
TYPICAL 7 PIN TRAILER
ELECTRICAL CONNECTOR
7 PIN TRAILER CONNECTOR
CONSTANT POWER (IGNITION)
STOPLIGHT POWER
GROUND