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OnStar System ('02 Model USA) OnStar Control Unit Input Test (cont'd) Disconnect the connectors from the unit Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained B17 B22 A32 B6 B3 B2 B18 WHT/YEL WHT BLK ORN RED/GRN BLK Under all conditions Ignition switch in ACC (I) Under all conditions Under all conditions Under all conditions Under all conditions Check for voltage to ground: Check for voltage to ground: There should be battery voltage. Check for continuity to ground: Connect to ground: Connect to ground: The taillights should come on. Check for continuity to ground: • Blown No. 56 (7.5 A) fuse in the under-hood fuse/relay box • An open in the wire under-dash fuse/relay box • An open in the wire • Blown No. 39 (15 A) fuse in the under-hood fuse/relay box • Faulty horn relay • Blown No. 1 (15 A) fuse in the under-dash fuse/relay box • Faulty taillight relay • An open in the wire Reconnect the connectors to the unit Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained B20 B5 A8 A25 A10 A11 A23 A24 GRN/WHT GRN/RED GRY BRN/YEL WHT BLU/RED BLK WHT Front passenger's door tral position Front passenger's door tral position Front passenger's door Under all conditions Under all conditions OnStar "DOT" button on. OnStar "DOT" button on. Under all conditions Ignition switch in ACC ton pushed. Speak into Check for voltage to ground: There should be battery voltage. Check for voltage to ground: There should be less than 1 V. Check for voltage to ground: Check for voltage to ground: Check for continuity to ground: There should be continuity. Check for continuity to ground: There should be continuity. Check for voltage between the A10 • Faulty front passenger's door lock key cylinder switch • Poor ground (G401, G402) 5 V when you should) • An open in the wire • An open in the wire • Faulty audio unit • Faulty audio unit • Faulty OnStar buttons and microphone phone • An open in the wire Main Menu Table of Contents |