WIS Document: 18113

| | +30 power supply Fault symptom The theft alarm is not working. | Important | Drop of +30 power supply to control module brings about total loss of functions. | Check the +30 power supply by arming/disarming the anti-theft alarm. | US/CA start fault diagnosis with step 1 | For EU, start fault diagnosis as point 2. | Diagnostic procedure 1 Check fuse 23 | - | Check that fuse 23 is intact and live. | - | Connect the test lamp to the fuse and a good grounding point. The test lamp should light. Is the test lamp on? | yes Continue with point 2. | no Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply". 2 Check the +30 power supply | - | Unplug connector H33-3. | - | Connect the test lamp to pin 5 of connector H33-3 and a good grounding point. The test lamp should light. Does the lamp light up? | yes Continue with point 4. | no Continue with point 3. 3 Check the wiring connected to the fuses | - | US/CA Connect the test lamp to fuse 23 and a good grounding point. The test lamp should light. Is the test lamp on? | yes Check and repair or replace the wiring between pin 5 of connector H33-3 and fuse 23. | no Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply". | - | EU Connect the test lamp to fuse 1 and a good grounding point. The test lamp should light. Is the test lamp on? | Yes Check and repair or replace the wiring between pin 5 of connector H33-3 and fuse 1. | No Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply". 4 Check the wiring connected to the electronic control module Check the wiring harness for continuity between pin 5 of connector H33-3 and pin 25 of the electronic control module. The resistance should be < 1 ohm. Is the resistance correct? | Yes Continue with point 5. | No Repair or replace the wiring harness. 5 Final check Check the operation and see if the fault symptoms are still present. Is the problem still present? | Yes See "Before replacing a control module". | No The remedial measures taken were correct or the fault is of intermittent nature.