Jeep Grand Cherokee WK. Manual — part 1284
possible by observing the scan tool. Steering wheel position is displayed as
9
Angle
9
with a range of up to ±
900 degrees. Since the SCM determines the position from the data of both sensors, the SCM does not have
to be initialized following a battery disconnect. Steering angle information is sent over the CAN C Bus.
•
Steering Angle Sensor (if equipped with Electronic Stability Program (ESP) - Vehicles equipped with ESP
use a steering angle sensor. The sensor is internal to the SCM and cannot be serviced separately. As the
steering wheel is rotated an internal data wheel or code disc interrupts infrared light beams. Optic clusters
containing three rows of four light detectors, determine steering wheel position based on which beams are
interrupted and which are not. The SCM can also distinguish all steering wheel position from lock to lock.
NOTE: Vehicles using Electronic Throttle Control (ETC) use a second (redundant) speed control sense
circuit.
The following components can be serviced separately.
•
Hazard Switch (2)
•
Right Multi-Function (wiper/washer) Switch (3)
•
Left Multi-Function (lighting control) Switch (1)
•
Cancel Cam
•
Steering Angle Sensor (if equipped with Elec-
tronic Stability Program (ESP)
•
Steering Control Module (SCM) with integral
clockspring (4)
OPERATION
The Steering Control Module (SCM) is connected to a battery feed and ground. It receives battery power on Cavity
8 of the 16-way Connector from the A108 circuit. It is protected by a 10 Amp fuse in Cavity 16 of the Junction Block.
It receives ground at Cavity 5 of the 16-way Connector, which is grounded on the Z907 circuit.
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COLUMN - SERVICE INFORMATION
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DIAGNOSIS AND TESTING
STEERING CONTROL MODULE SWITCHES
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
The left multi-function switch and right multi-function switch can be diagnosed using conventional diagnostic tools
and methods. However, proper testing of the multiplexed inputs to the Steering Control Module (SCM) requires the
use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
NOTE: Only the effected cavities are listed in each
of the tables.
LEFT MULTI-FUNCTION (LIGHTING CONTROL) SWITCH RESISTANCE - TURN AND BEAM SELECT
FUNCTION
CAVITY
RESISTANCE
1
2
3
Nuetral
X
X
X
Open
Right Turn
X
X
0 Ohms
Left Turn
X
X
649 Ohms
High Beam
X
X
649 Ohms
Flash to Pass
X
X
0 Ohms
LEFT MULTI-FUNCTION (LIGHTING CONTROL) SWITCH RESISTANCE - EXTERIOR LAMPS
FUNCTION
CAVITY
RESISTANCE
4
5
6
7
Off
X
X
869 Ohms
Park Lamps
X
X
221 Ohms
Headlamps
X
X
221 Ohms
Auto
X
X
69 Ohms
Fog Lamps
X
X
0 Ohms
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COLUMN - SERVICE INFORMATION
19 - 51
NOTE: Only the cavities being tested are listed in
each of the tables.
RIGHT MULTI-FUNCTION (WIPER/WASHER) SWITCH RESISTANCE - WASH AND MIST
FUNCTION
CAVITY
RESISTANCE
1
2
Wash
X
X
0 Ohms
Mist
X
X
650 Ohms
RIGHT MULTI-FUNCTION (WIPER/WASHER) SWITCH RESISTANCE - FRONT WIPER FUNCTIONS
FUNCTION
CAVITY
RESISTANCE
7
9
Off
X
X
1581 Ohms
Delay 1
X
X
695 Ohms
Delay 2
X
X
463 Ohms
Delay 3
X
X
323 Ohms
Delay 4
X
X
232 Ohms
Delay 5
X
X
169 Ohms
Low
X
X
96 Ohms
High
X
X
0 Ohms
RIGHT MULTI-FUNCTION (WIPER/WASHER) SWITCH RESISTANCE - REAR WIPER FUNCTIONS
FUNCTION
CAVITY
RESISTANCE
4
5
Wash
X
X
0 Ohms
Off
X
X
1045 Ohms
Intermittant
X
X
382 Ohms
Wiper
X
X
174 Ohms
Wash0 Ohms
X
X
0 Ohms
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COLUMN - SERVICE INFORMATION
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REMOVAL
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
CAUTION: All fasteners must be torqued to specification to ensure proper operation of the steering column.
1. Position the front wheels straight-ahead.
2. Disconnect and isolate the negative (ground) cable
from the battery.
WARNING: Wait two minutes for the airbag system
reserve capacitor to discharge before performing
further diagnosis or service.
3. Remove the driver airbag (Refer to 8 - ELECTRI-
CAL/RESTRAINTS/DRIVER AIRBAG - REMOVAL).
4. Remove the steering wheel retaining bolt (4), then
slide the steering wheel (3) off the shaft (5).
Remove the steering column shrouds (1 & 2). (Refer
to 19 - STEERING/COLUMN/SHROUD - REMOVAL).
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COLUMN - SERVICE INFORMATION
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