Checking the SET function
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Checking the SET function
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Important
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The following conditions must be fulfilled before activation of the SET function in the
Cruise Control system control module will be possible:
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Pin
A
(1): 0 V
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Pin
B
(2): approx. 12 V
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Pin
C
(3): 0 V
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1.
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Connect the BOB and
check that about 12 V is present across terminal B (2) of the Cruise Control connector and a
good ground. Also check that no voltage (0 V) is present across terminals A (1) and C (3) and
a good ground when the SET button is held in the depressed position.
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2.
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If the voltage readings are not OK, check that 12 V is present across pin
7 of the switch connector and a good ground.
If the voltage is OK, continue with point 4.
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3.
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If the voltage is not OK, check the wiring for continuity or a short circuit
by measuring the resistance across the load side of the fuse and pin 7 of the switch
connector.
If the resistance is > 1 ohm, rectify the fault.
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4.
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Check the switch by holding it in the SET position and measuring the
resistance across pins 7 and 10.
Hold the switch in the ON/OFF position and measure the resistance across pins 7
and 9 and also across pins 7 and 8.
If the resistance reading obtained during any measurement is > 1 ohm, fit a new
switch.
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5.
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If the resistance is > 1 ohm, check the wiring for continuity or a short
circuit by measuring the resistance across:
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pin 10 of the switch connector and pin B (2) of the
Cruise Control connector.
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pin 9 of the switch connector and pin C (3) of the Cruise Control connector.
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pin 8 of the switch connector and pin A (1) of the Cruise Control connector. If the
resistance is > 1 ohm, rectify the fault.
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6.
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If it has not been possible to determine a fault using the above checks, continue
fault diagnosis with
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