- Disconnect negative battery cable.
- Connect the J 38758 male end to the negative battery terminal.
- Turn the test switch knob to the OFF position.
- Connect the negative battery cable to the J 38758 female end.
- Turn the DMM to ON.
- Road test the vehicle with all of the accessories on.
- Turn the ignition to LOCK.
- Remove the ignition key.
- Set the ammeter to 10 A.
- Connect the J 38758 to the test meter terminals with alligator clips.
- Turn the DMM to OFF.
- Check the current reading:
- When the cause of the current draw has been located and repaired, perform the following:
Notice: The parasitic draw test switch should never be turned to the OFF position with the engine running. Damage could occur to the attached ammeter or the vehicle electrical system.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Important: Always turn the test switch tool knob to the ON position before removing each fuse to maintain continuity in the electrical system and to avoid damaging the ammeter due to an accidental overload (i.e. opening door to change a fuse, etc.).
| • | A reading below 25 mA is acceptable. |
| • | If the current reading is at or below 2 A, perform the following steps: |
| - | Turn the DMM to ON. |
| - | Switch the ammeter to a lower scale. |
| - | If necessary, use a more accurate meter. |
| - | Turn the DMM to OFF. If the reading is above 25 mA, refer to Electrical Diagnosis. |
| • | A zero reading indicates a problem with the meter, the scale being used, or a connection. |
| • | If the reading is above specifications, perform the following: |
| - | Remove the system fuses one at a time until current draw returns to a value less than or equal to the specifications. Refer to Parasitic Load Examples Table below. |
| - | Perform steps 11 and 12 above each time a fuse is removed. |
| • | A reading above 100 mA may suggest the following: |
| - | Grounded wires |
| - | Sticking relays |
| - | A light is ON. |
| - | Refer to Electrical Diagnosis in order to make necessary repairs. |
| • | Repeat steps 11 and 12 above in order to verify the repair. |
| • | Turn the DMM to OFF. |
| • | Remove the J 38758 . |
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
| • | Connect the negative battery cable. |
Tighten
Tighten the negative battery cable to 15 N·m (11 lb ft).
Component | Approximate Parasitic Load (mA) | |
|---|---|---|
Typical | Maximum | |
Adaptive Lamp Monitor | 0.5 | 1.0 |
ALC (After 7 Minute Time Out) | -- | 1.0 |
Blower Control Module (C68 or CJ2) | 1.0 | 2.0 |
Electronic Brake (& Traction) Control Module (After 4 Minute Time Out) | 1.0 | 1.5 |
Generator | 2.0 | 2.0 |
Heated Seat Control Module | 0.5 | 1.0 |
HVAC Programmer | 0.5 | 0.75 |
Instrument Panel -- Digital Cluster | 4.0 | 6.0 |
Instrument Panel -- Gages Cluster | 4.0 | 6.0 |
Lamp Control Module (T61/T82) | 0.5 | 1.0 |
PASS-Key® II Theft Deterrent Module | 0.75 | 1.0 |
Powertrain Control Module (PCM) | 5.0 | 7.0 |
Pull-Down Unit | 1.0 | 3.0 |
RFA Module | -- | 3.8 |
Radio | 7.0 | 8.5 |
Compact Disk (CD) Changer | 1.8 | 3.5 |
