Jeep Grand Cherokee WK. Manual - part 266

SWITCH - REMOTE RADIO

DESCRIPTION

Two rocker-type switches (2) are mounted in the sides
of the rear (instrument panel side) steering wheel trim
cover. The switch on the left spoke is the seek switch
and has seek up, seek down, and preset station
advance functions. The switch on the right spoke is
the volume control switch and has volume up, and vol-
ume down functions. The switch on the right spoke
also includes a “mode” control that allows the driver to
sequentially select AM radio, FM radio, cassette player
or CD player.

OPERATION

The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary switches
that are hard wired to the Instrument cluster through the clockspring. The instrument cluster sends a five volt ref-
erence signal to both switch units on one circuit, and senses the status of all of the switches by reading the voltage
drop on a second circuit.

When the instrument cluster senses an input (voltage drop) from any one of the remote radio switches, it sends the
proper switch status messages on the Controller Area Network (CAN) data bus to the radio. The electronic circuitry
within the radio is programmed to respond to these remote radio switch status messages by adjusting the radio
settings as requested.

DIAGNOSIS AND TESTING

REMOTE SWITCHES

Any diagnosis of the Audio system should begin with the use of a scan tool and the appropriate Diagnostic
Service information.

Refer to the appropriate wiring information.

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.

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AUDIO/VIDEO - SERVICE INFORMATION

1. Remove the remote radio switch(es) (1) and (2)

from the steering wheel (Refer to 8 - ELECTRICAL/
AUDIO/REMOTE SWITCHES - REMOVAL).

2. Use an ohmmeter to check the switch resistances

as shown in the Remote Radio Switch test table. If
the remote radio switch resistances are not as indi-
cated, replace the inoperative switch.

REMOTE RADIO SWITCH TEST

SWITCH

SWITCH POSITION

RESISTANCE

Right or Left

Neutral

24K Ohms ± 5%

Right (White)

Volume Up

6.8K Ohms ± 5%

Right (White)

Volume Down

15.6K Ohms ± 1%

Right (White)

Mode

0 Ohms

Left (Black)

Seek Up

1.2K Ohms ± 5%

Left (Black)

Seek Down

3.3K Ohms ± 5%

Left (Black)

Pre-Set Station Advance

.47K Ohms ± 5%

REMOVAL

AUDIO/VIDEO - SERVICE INFORMATION

8A - 201

1. Disconnect and isolate the battery negative cable.

2. Remove the driver side airbag (5) from the steering

wheel

(1).

(Refer

ELECTRICAL/RE-

STRAINTS/DRIVER AIRBAG - REMOVAL).

3. Remove the speed control switch (3) or (6) located

on the same side of the steering wheel as the
remote radio switch that is being serviced. (Refer
to 8 - ELECTRICAL/SPEED CONTROL/SWITCH -
REMOVAL).

4. Disconnect the steering wheel wire harness con-

nector from the connector receptacle of the remote
radio switch.

5. Disengage the four remote radio switch latches that

secure the switch to the inside of the mounting
hole in the steering wheel rear trim cover.

6. From the outside of the steering wheel rear trim

cover, remove the remote radio switch (2) from the
trim cover.

INSTALLATION

1. Position the remote radio switch (2) to the mount-

ing hole on the outside of the steering wheel rear
trim cover. Be certain that the connector receptacle
is oriented toward the bottom of the switch and
pointed toward the center of the steering wheel.

2. Press firmly and evenly on the remote radio switch

until each of the switch latches is fully engaged in
the mounting hole of the steering wheel rear trim
cover.

3. Reconnect the steering wheel wire harness con-

nector to the connector receptacle of the remote
radio switch.

4. Install the speed control switch (3) (6) onto the

steering wheel. (Refer to 8 - ELECTRICAL/SPEED
CONTROL/SWITCH - INSTALLATION).

5. Install the driver side airbag (5) to the steering

wheel

(1).

(Refer

ELECTRICAL/RE-

STRAINTS/DRIVER AIRBAG - INSTALLATION).

6. Connect the battery negative cable.

SPEAKER

DESCRIPTION

STANDARD

The standard equipment speaker system includes speakers in six locations. One 6.4 centimeter (2.50 inch) diameter
tweeter is installed on each end of the instrument panel. One 15.2 by 22.9 centimeter (6 by 9 inch) full-range
speaker is located in each front door. There is also one full-range 16.5 centimeter (6.5 inch) diameter full-range
speaker located in each rear door.

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AUDIO/VIDEO - SERVICE INFORMATION

BOSTON ACOUSTICS

The Boston Acoustics speaker system includes speakers in six locations. Each of the standard speakers is replaced
with Boston Acoustics speakers. One 6.4 centimeter (3.50 inch) diameter speaker is installed on each end of the
instrument panel. One 15.2 by 22.9 centimeter (6 by 9 inch) speaker is located in each front door. One 16.5 cen-
timeter (6.5 inch) diameter speaker is located in each rear door. The Boston Acoustics speaker system also includes
an amplifier. The total available power of the premium speaker system is approximately 288 watts.

DIAGNOSIS AND TESTING

SPEAKER

Any diagnosis of the Audio system should begin with the use of a scan tool and the appropriate Diagnostic
Service information.

Refer to the appropriate wiring information.

CAUTION: The speaker output of the radio is a “floating ground” system. Do not allow any speaker lead to
short to ground, as damage to the radio may result.

1. If all speakers are inoperative, check the radio fuses in the junction block. If OK, go to Step 2. If not OK, repair

the shorted circuit or component as required and replace the faulty fuse.

2. Check the amplifier fuse (if equipped) in the junction block. If OK, go to Step 3. If not OK, repair the shorted

circuit or component as required and replace the faulty fuse.

3. Turn the ignition switch to the ON position. Turn the radio receiver ON. Adjust the balance and fader control

controls to check the performance of each individual speaker. Note the speaker locations that are not performing
correctly. Go to Step 4.

4. Turn the radio OFF. Turn the ignition OFF. Disconnect and isolate the battery negative cable. If vehicle is not

equipped with a amplifier, remove the radio receiver. If the vehicle is equipped with an amplifier, disconnect the
wire harness connectors. There are two connectors. The one on the body harness has body speakers only. The
other on the instrument panel harness has the instrument panel speakers, battery, ground, and CAN. Go to Step
5.

5. Check both the speaker feed (+) circuit and return (-) circuit cavities for the inoperative speaker at the wire har-

ness connector for continuity to ground. There should be no continuity. If OK, go to Step 6. If not OK, repair the
shorted speaker feed (+) and/or return (-) circuits(s) to the speaker as required.

6. Disconnect wire harness connector at the inoperative speaker. Check for continuity between the speaker feed (+)

circuit cavities of the radio receiver wire harness connector or if equipped, the amplifier wire harness connector
and the speaker wire harness connector. Repeat the check between the speaker return (-) circuit cavities of the
radio receiver wire harness connector and the speaker wire harness connector. In each case, there should be
continuity. If OK, replace the faulty speaker. If not OK, repair the open speaker feed (+) and/or return (-) cir-
cuits(s) as required.

AUDIO/VIDEO - SERVICE INFORMATION

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