Ignition-Off Draw Test

BATTERY IGNITION OFF DRAW

High current draw on the battery with the ignition OFF will discharge a battery. After a dead battery is recharged, the vehicle ignition off draw (IOD) should be checked. To determine if a high current draw condition exists first check the vehicle with a test lamp.

1. Verify that all electrical accessories are OFF.
- Remove key from ignition switch
- Turn off all lights
- Trunk lid is closed
- Engine compartment hood lamp is disconnected or lamp removed
- Map lamp on rear view mirror
- Glove box door is closed
- Sun visor vanity lights are OFF
- All doors are closed
- Allow the ignition key lamp system to time out in approximately 30 seconds, if equipped.

Disconnect and Isolate Battery Negative Cable:

2. Disconnect battery negative cable.

Milliampere Meter Connection:

3. Connect a 12 Volt test lamp, with a cold resistance of 5-7 ohms, between the battery negative cable clamp and the negative post. If test lamp goes out system is OK. If test lamp lights and stays ON, go to Test Lamp Stays ON procedure.

Test Lamp Stays On
There is either a short circuit or a fault in an electronic module. Two fuses in the Power Distribution Center (PDC) feed the modules with ignition off draw.
- Interior lamps fuse (10 Amp) (IOD) PDC
- Fuel pump fuse (20 Amp) in PDC.

1. Remove interior lamp and fuel pump fuses. By removing these fuses all ignition off draw from the vehicle electronics will be disconnected. The test lamp should go out. If test lamp goes out go to Step
2. If test lamp does not go out there is a current draw or short circuit.
2. Install the fuel pump fuse. If test lamp lights, there is a current draw or short circuit in the A14 wiring circuit feed.
a. Disconnect Powertrain Control Module.
b. If test lamp goes out, replace Powertrain Control Module.
c. If test lamp does not go out, there is a cur rent draw or short circuit in the A14 circuit feed.
3. Install the interior lamp fuse. If test lamp lights, there is a current draw or short circuit in the M01 circuit. If test lamp stays out, go to Step 4.

Milliampere Meter Connection:

4. Use a multi-meter that has at least a range of 200 milliamperes. Install meter between the battery negative cable and battery negative post. Carefully remove the test lamp without disconnecting the meter. After all modules time-out the total vehicle IOD should be less than 10 milliamperes. If ignition off draw is more than 10 milliamperes go to Step 5.
5. Remove both fuses from the Power Distribution Center:
- Fuel pump fuse (20 Amp)
- Interior lamps fuse (10 Amp)
6. If there is any reading with fuses removed there is a current draw or short circuit in the wiring. If OK go to Step 7.
7. Install interior lamp fuse. After installing fuse, the current can reach 250 milliamperes. After time-out the reading should not exceed 8 milliamperes. If NOT OK go to Step 8. If OK go to Step 9.
- Ignition key lamp system
- Radio
- Remote keyless entry module, if equipped
8. Disconnect radio and ignition switch key lamp one component at time, to see if any component is at fault. If the high reading is not eliminated there is a short circuit in the wiring.

CAUTION: Always disconnect the meter before opening a door.

9. Remove interior lamps fuse and install the fuel pump fuse. The reading should be between 1-3 milliamperes. If reading is higher than 3 milliamperes:
a. Disconnect Powertrain Control Module.
b. If reading drops to zero, replace Powertrain Control Module.
c If reading remains the same there is a current draw or short circuit in the A14 circuit.