Opel Frontera UBS. Service manual — part 712
8D–278
WIRING SYSTEM
Parts Location (LHD)
Legend
(1) B-52
(2) H-7, H-8, H-25
(3) H-32
(4) Fuse Box
(5) B-16
(6) B-13
(7) Mode Switch (M-25)
(8) H-10, H-11, H-53
(9) Cruise Control Unit (B-9)
(10) C-37
(11) Relay and Fuse Box
(12) H-12, H-48
(13) B-2
(14) I-6
(15) I-9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
D08RW394
WIRING SYSTEM
8D–279
Diagnosis
The cruise control unit uses the cruise main indicator light and diagnoses the failure, when the control unit
detects abnormality on the table below.
PART
POSIBLE CAUSE
DETECTION PERIOD
DTC
Motor system short circuit
Energizing motor
1–1
Clutch system short circuit
Energizing clutch
1–2
Actuator
Clutch system open circuit
Energizing clutch
1–2
Mechanical defect
Cruise controlling
1–3
Close side of motor system open circuit
Cruise controlling
1–1
Cruise
Open side of motor system continuously energizing
While starter sw on
1–4
control unit
Clutch output abnormality
While starter sw on
1–4
Vehicle
Signal of vehicle speed disconnection
Cruise controlling
2–1
speed sensor
Signal of vehicle speed abnormality
Cruise controlling
2–1
Switch
Turning on switch at all times
While starter sw on
3–1
Turning on switch at the same time.
While starter sw on
3–1
DTC: Diagnostic Trouble Code
DTC Display Condition
1.
While starter swi
tch on and vehicle speed is 0 km/h, the DTC output begins in top priority by cancel switch
turn on and off being repeated three times for 2 sec. while cruise main switch pushing on, and stops the
DTC output whether vehicle speed is more than 10 km/h or the resume switch is turned on.
2.
The cruise control unit outputs the DTC(s) in order from small figure of the code.
3.
The header of display of DTC(s) is assumed 4 sec., and it is 2 sec. between different kind of codes.
4.
The DTC(s) are
erased with the starter switch turned off.
DTC Display Format
1.
When no DTCs are detected. (The unit : sec.)
2.
When two or more DTCs are detected. (The unit ; sec.)
0.25 0.25
Code 1–1
Code 2–2
4
1
0.5
1
1
1
1
1
1
1
2
8D–280
WIRING SYSTEM
DTC 1–1 Motor System Short Circuit
STEP
ACTION
VALUE(S)
YES
NO
1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Measure resistance between actuator side connector
terminal 1 and 2.
NOTE: If control plate position is fully opened or fully
closed, resistance can not be measured.
Is the resistance within range specified in the value(s)
column?
Measure continuity between harness side connector C–37
terminal 1 and the ground, terminal 2 and the ground, and
terminal 1 and 2.
Are the results same as specified in the value(s) columns?
More than 4.2
Ω
No continuity
Go to
step 2
Replace
the control
unit
Replace
the
actuator
Repair or
replace
the
harness
1
2
WIRING SYSTEM
8D–281
DTC 1–2 Clutch System Open or Short Circuit
STEP
ACTION
VALUE(S)
YES
NO
1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Measure resistance between actuator side connector
terminal 3 and 4.
Is the resistance within range specified in the value(s)
column?
1. Disconnect the brake switch connector B–13.
2. Check continuity between switch side connector terminal 2
and 3.
Is there continuity between terminals?
1. Reconnect the brake switch connector B–13.
2. Check continuity between harness side connector B–9
terminal 6 and connector C–37 terminal 3, connector C–37
terminal 4 and connector B–9 terminal 8.
Is there continuity between terminals?
Is there continuity between harness side connector C–37
terminal 3 and the ground, connector C–37 terminal 4 and
the ground, connector B–9 terminal 6 and the ground?
Are the results same as specified in the value(s) column?
34.7 – 42.4
Ω
–
–
No continuity
Go to
step 2
Go to
step 3
Go to
step 4
Replace
the control
unit
Replace
the
actuator
Adjust the
switch or
replace it
Repair
open
circuit
Repair
short
circuit
1
2
3
4
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