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Communication between the ICE module and SID unit

Communication between the ICE module and SID unit


1. Plug in the scan tool and select "READ FAULT CODES" from the menu. If any trouble codes are present, continue on .


2. If no trouble codes are present, plug in a BOB and connect a voltmeter across connector pins 37 and 70.


Select "ACT. INSTR. FUNCT" on the scan tool and then "SID OUTPUT" in order to make the output high and low.

The voltmeter readings should be:

about 0 V with the ignition switch "ON".

about 12 V with the ignition switch "OFF".

3. If not, connect the SID unit to the BOB and check the lead for breaks/shorting between the ICE module and the SID unit with both control modules disconnected.


4. If the leads are OK, the fault is probably in one of the control modules. Plug in the ICE control module and repeat point 2 while grounding pin 8 of the SID unit connector at the same time.



If the signals are OK, the fault is probably in the SID unit. Continue fault diagnosis as described in Service Manual 3:5 "Electrical system, SID".

If the signals are not OK, the fault is probably in the ICE module. Proceed to .