Bendix Commercial Vehicle Systems MC-12 MODULATOR CONTROLLER ASSY - Manual (Page 11)

11
Troubleshooting
SECTION I
TRAILER STATUS LAMP TESTING
REPEAT THE “INITIAL
START-UP PROCEDURE”.
START HERE
USING A JUMPER WIRE CONNECT PIN A TO D THEN B
TO D. WITH THE CONNECTION IN PLACE NOTE THE
CONDITION OF TRAILER STATUS LAMP.
TRAILER STATUS LAMP ON?
NO
YES
REPLACE EC-12 ™
CONTROLLER AND RETEST.
CHECK THE FOLLOWING IN THE ORDER PRESENTED AND
AFTER REPLACING OR TESTING EACH COMPONENT,
TEST THE STATUS LAMP OPERATION:
1. CHANGE TRAILER STATUS LAMP BULB
2. CHECK TRAILER STATUS LAMP WIRING-GROUND
3. CHECK CONTINUITY OF WARNING WIRE BETWEEN PIN
D ON THE 14 PIN CONNECTOR AND THE TRAILER STATUS
LAMP SOCKET
EC-12 ™ CONTROLLER
WIRE HARNESS CONNECTOR
WITH TRACTOR IGNITION OFF, DISCONNECT
14 PIN WIRE HARNESS CONNECTOR FROM
EC-12 ™ CONTROLLER THEN TURN TRACTOR
IGNITION ON AND MAKE AND HOLD A BRAKE
APPLICATION.
A B C D E F G H J K L M N P
POWER A & B
TRAILER STATUS
LAMP D