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Group 28 Troubleshooting
Check of Component
Cruise control set switch
Note: Faults in the component can be caused by faults
in the wiring harness of the VECU. A check of the wiring
harness should also therefore be made before connect-
ing a new component.
1
Disconnect the connector at the switch
for the cruise control. Measurements
should be taken only on the cruise
control switch connector.
2
Turn the ignition key to the OFF posi-
tion.
3
Connect an ohmmeter to the connec-
tor and measure the resistance.
Measuring points Expected value
open circuit (SET+ and
SET- inactive)
open circuit (ON and
SET+ active)
open circuit (RESUME
active and SET+ ac-
tive)
open circuit (ON and
SET- active)
Cruise control switch
connectors E / G
open circuit (RESUME
active and SET- active)
J-39200
Check of Subsystem
1
Disconnect the VECU and install
adapter J-43234 between the VECU
and wiring harness connectors PA/PB.
J-43234
2
Connect 60-pin breakout box 9998551
(with overlay J-43340) to the adapter.
9998551
J-43340
Signal wire:
3
Turn the ignition key to the ON posi-
tion.
4
Connect a voltmeter to the 60-pin
breakout box and measure the voltage.
Measuring points Expected value
B+ (OFF and SET- ac-
tive)
0 V (OFF and SET+
active)
0 V (ON and SET+ ac-
tive)
PA1 / PA12
0 V (RESUME active
and SET+ active)
B+ (OFF and SET+
active)
0 V (OFF and SET-
active)
0 V (ON and SET- ac-
tive)
PA2 / PA12
0 V (RESUME active
and SET- active)
J-39200
Verification
To check that the fault has been corrected, use the test
in the VCADS Pro tool (see “Appropriate Tests in the
VCADS Pro Tool” page 235).
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