Ignition-Off Draw Test

Verify that all electrical accessories are off. Turn off all lamps, remove the ignition key, and close all doors. If the vehicle is equipped with an illuminated entry system or an electronically tuned radio, allow the electronic timer function of these systems to automatically shut off (time out). This may take up to 3 minutes.
Determine that the underhood lamp is operating properly, then disconnect the lamp wire harness connector or remove the lamp bulb.
Disconnect the battery negative cable.
Set an electronic digital multimeter to its highest amperage scale. Connect the multimeter between the disconnected battery negative terminal post and negative cable terminal clamp. Make sure that the doors remain closed so that the illuminated entry system is not activated. The multimeter amperage reading may remain high for up to 3 minutes, or may not give any reading at all while set in the highest amperage scale, depending upon the electrical equipment in the vehicle. The multimeter leads must be securely clamped to the battery negative cable terminal post and negative cable terminal clamp. If continuity between the battery negative terminal post and the negative cable terminal clamp is lost during any part of the IOD test, the electronic timer function will be activated and all of the tests will have to be repeated.
After about 3 minutes, the high-amperage IOD reading on the multimeter should become very low or nonexistent, depending upon the electrical equipment in the vehicle. If the amperage reading remains high, remove and replace each fuse or circuit breaker in the Power Distribution Center (PDC) and then in the Junction Block (JB), one at a time until the amperage reading becomes very low, or nonexistent. Refer to the appropriate wiring information for complete PDC and JB fuse, circuit breaker, and circuit identification. This will isolate each circuit and identify the circuit that is the source of the high-amperage IOD. If the amperage reading remains high after removing and replacing each fuse and circuit breaker, disconnect the wire harness from the generator. After the high-amperage IOD has been corrected, switch the multimeter to progressively lower amperage scales and, if necessary, repeat the fuse and circuit breaker remove-and-replace process to identify and correct all sources of excessive IOD. It is now safe to select the lowest milliampere scale of the multimeter to check the low amperage IOD.

CAUTION: DO NOT open any doors, or turn on any electrical accessories with the lowest milliampere scale selected, or the multimeter may be damaged.

Observe the multimeter reading. The low-amperage IOD should not exceed 35 milliamperes (0.035 ampere). If the current draw exceeds 35 milliamperes, isolate each circuit using the fuse and circuit breaker remove-and-replace process in step 5. The multimeter reading will drop to within the acceptable limit when the source of the excessive current draw is disconnected. Repair this circuit as required; whether a wiring short, incorrect switch adjustment, or a component failure is at fault.