Jeep Grand Cherokee WK. Manual — part 395
WARNING: DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, SIDE AIRBAG, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MIN-
UTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNO-
SIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE
THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
1. Disconnect and isolate the battery negative cable.
2. Remove the trim cover from the driver side airbag.
(Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER
AIRBAG - REMOVAL).
3. Remove the horn switch (2) and tray (6) as a unit
from the pouch on the retaining strap of the driver
side airbag (5)
.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
1. Install the horn switch (2) and tray as a unit into
the pouch on the retaining strap of the driver side
airbag (5).
NOTE: Be certain that the tray is facing the airbag
module, that the horn switch is facing the trim
cover, that the horn switch feed wire is on the left,
and that the horn switch ground wire is on the
right.
2. Install the trim cover onto the driver side airbag. (Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER AIRBAG -
INSTALLATION) for the procedure.
3. Connect the battery negative cable.
8H - 20
HORN SYSTEM - SERVICE INFORMATION
WK
IGNITION CONTROL
TABLE OF CONTENTS
page
page
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
IGNITION SYSTEM - SERVICE INFORMATION. . . 11
IGNITION SYSTEMS - ELECTRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
IGNITION SYSTEMS - ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
B211E–IGNITION RUN/ACC/PAD CONTROL
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . . . 2
B211F–IGNITION RUN/ACC/PAD CONTROL
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . . . 5
B2120–IGNITION RUN/ACC/PAD CONTROL
CIRCUIT OPEN . . . . . . . . . . . . . . . . . . . . . . . . 8
IGNITION SYSTEMS - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
WK
IGNITION CONTROL
8I - 1
B211E–IGNITION RUN/ACC/PAD CONTROL CIRCUIT LOW
8I - 2
IGNITION SYSTEMS - ELECTRICAL DIAGNOSTICS
WK
B211E–IGNITION RUN/ACC/PAD CONTROL CIRCUIT LOW (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Front Control Module will set this DTC within 500ms if the (P305) Accessory Delay Relay Control circuit is
open or shorted to ground.
Possible Causes
(P305) ACCESSORY DELAY RELAY CONTROL CIRCUIT OPEN
(P305) ACCESSORY DELAY RELAY CONTROL CIRCUIT SHORTED TO GROUND
ACCESSORY DELAY RELAY
FRONT CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC’s.
Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.
With the scan tool, read the active DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Go To 2
No
>> If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness con-
nectors. Look for broken, bent, pushed out, or corroded terminals.
2.
ACCESSORY DELAY RELAY
Turn the ignition off.
Install a substitute relay in place of the original Accessory Delay Relay.
Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.
With the scan tool, read the active FCM DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Go To 3
No
>> Replace the original Accessory Delay Relay.
Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1).
WK
IGNITION SYSTEMS - ELECTRICAL DIAGNOSTICS
8I - 3
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