Dodge Durango (HB). Manual - part 267

OPERATION

The ISO-standard rear window defogger (EBL) relay consists of an electromagnetic coil, a resistor or diode, and
three (two fixed and one movable) electrical contacts. The movable (common feed) relay contact is held against one
of the fixed contacts (normally closed) by spring pressure. When the electromagnetic coil is energized, it draws the
movable contact away from the normally closed fixed contact, and holds it against the other (normally open) fixed
contact.

When the electromagnetic coil is de-energized, spring pressure returns the movable contact to the normally closed
position. The resistor is connected in parallel with the electromagnetic coil in the relay, and helps to dissipate volt-
age spikes that are produced when the coil is de-energized.

Refer to the appropriate wiring information for diagnosis and testing of the EBL relay and for complete EBL system
wiring diagrams.

REMOVAL

1. Disconnect and isolate the negative battery cable.

2. Remove the trim cover from the cowl (2) on the

driver side of the vehicle (Refer to 23 - BODY/IN-
TERIOR/COWL TRIM COVER - DESCRIPTION).

3. Locate the junction block (JB) (1).

Note: Refer to the fuse and relay layout map on
the inner surface of the JB cover for EBL relay
identification and location.

4. Remove the EBL relay from the JB.

HEATED GLASS - SERVICE INFORMATION

8G - 15

INSTALLATION

Note: Refer to the fuse and relay layout map on
the inner surface of the junction block (JB) cover
for EBL relay identification and location.

1. Position the EBL relay into the proper receptacle of

the JB (1).

2. Align the EBL relay terminals with the terminal cav-

ities in the JB receptacle and push down firmly on
the relay until the terminals are fully seated.

3. Install the trim cover onto the driver side cowl

(2).(Refer to 8 - ELECTRICAL/POWER DISTRIBU-
TION/JUNCTION BLOCK - DESCRIPTION).

4. Reconnect the negative battery cable.

SWITCH-REAR WINDOW DEFOGGER

DESCRIPTION

The rear window defogger switch (2) is integrated into
the A/C-heater control (1) which is mounted to the
center of the instrument panel. The rear window
defogger switch and the rear window defogger LED
indicator (3) cannot be repaired and, if faulty or dam-
aged, the A/C-heater control must be replaced.

OPERATION

An LED indicator will illuminate when the rear window defogger control switch is activated. When the control switch
is activated, the A/C-heater control requests the front control module (FCM) to operated the rear window defogger
(EBL) relay via the controller area network (CAN) B bus. The EBL relay controls the current flow to the grids of the
rear window defogger and to the heated power side view mirrors, when equipped. The EBL relay will be on for
approximately 15 minutes or until the control switch or the ignition switch is turned off.

8G - 16

HEATED GLASS - SERVICE INFORMATION

HEATED MIRRORS - ELECTRICAL DIAGNOSTICS

TABLE OF CONTENTS

page

HEATED MIRRORS - ELECTRICAL

DIAGNOSTICS
DIAGNOSIS AND TESTING

B1D35,B1D39–MIRROR HEATER CONTROL

CIRCUIT OPEN – MEMORY MIRROR
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

BODY VERIFICATION TEST – VER 1

. . . . . . 23

HEATED MIRRORS - ELECTRICAL DIAGNOSTICS