CRUISE CONTROL SYSTEM TESTS
(ELECTRIC ACTUATOR)
Use BMW Service Test 2013 to check function of system
as follows:
Program: Enter M (Multimeter)
Enter 13 (Frequency out)
Enter 110 (Hz)
Press
Enter 02 (U. AC.)
Press
1. Detach the differential reed switch plug and attach frequency
out (+) to brown/red wire and frequency out (-) to brown
wire.
2. Turn on ignition.
3. Speedometer should show approximately 50 mph.
4. Engage cruise control and monitor the actuator. (It should
pull the throttle open.)
5. If cruise control does not engage, check for A.C. voltage on
E.C.U. plug terminal #6. (It should be approximately 4.0
volts.)
6. Check plug connections on back of instrument cluster.
7. If system is still inactive, perform the following tests:
Test at ECU Plug
Component/Circuit
Result
1. Ignition on—check volt-
age at Terminal #1.
Power supply
12 Volts. If not, check
wiring and fuse.
2. Ignition on—check volt-
age at Terminal #2.
Control switch OFF
Move lever to OFF. Voltage
drops from 12V to 0V. If
not, check wiring and
switch.
3. Ignition on—check volt-
age at Terminal #4.
Control switch CONST.
Move lever to CONST.
Voltage jumps 0 to 12V.
If not, check wiring and
switch.
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