Parasitic Draw Check
Parasitic Draw Check
Special Tools Required
LH41 AC/DC low current clamp meter, FLULH41A
**: Available through the Acura Tool and Equipment Program, 888-424-6857
- Parasitic draw check 1 (with LH41 AC/DC low current clamp meter (FLULH41A))
-1. Make sure the 12 volt battery is fully charged, and that all the vehicle's electrical accessories are turned off.
-2. To make the security alarm system recognize that the hood is closed, open the hood, and disconnect the hood latch switch 2P connector.
-3. Connect the hood latch switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
-4. Turn the vehicle to the ON mode.
-5. Turn the vehicle to the OFF (LOCK) mode.
-6. Make sure there is nothing connected to the data link connector (DLC).
-7. Get out of the vehicle, and close all doors, in-bed trunk lid, and tailgate securely.
-8. Lock the doors with the keyless remote.
-9. Make sure the individual map lights are turned off, and the security alarm system is armed.
-10. Wait for at least 20 minutes.
-11. Attach the LH41 AC/DC low current clamp meter (A) to the 12 volt battery ground cable (B). Follow the equipment manufacturer's instructions.
NOTE: If you are using a digital multimeter: go to step 2.
-12. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA Is the measured valued less than the threshold?
YES
Intermittent failure, the system is normal at this time.
NO
Go to step 3.
- Parasitic draw check 2 (without LH41 AC/DC low current clamp meter (FLULH41A)):
NOTE: If LH41 AC/DC low current clamp meter (FLULH41A) is not available, do the follow procedure with a digital multimeter.
-1. Make sure the 12 volt battery is fully charged, and that all the vehicle's electrical accessories are turned off.
-2. To make the security alarm system recognize that the door is closed, open the hood, and disconnect the hood latch switch 2P connector.
-3. Connect the hood latch switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
-4. Turn the vehicle to the ON mode.
-5. Turn the vehicle to the OFF (LOCK) mode.
-6. Get out of the vehicle, and close all doors, in-bed trunk lid, and tailgate securely.
-7. Lock the doors with the keyless remote.
-8. Make sure the individual map lights are turned off, and the security alarm system is armed.
-9. Make sure there is nothing connected to the data link connector (DLC).
-10. Wait for at least 20 minutes.
-11. Check the following items before measuring:
- During the procedure, do not depress the brake pedal, when you are prompted to turn the vehicle ON. Otherwise the vehicle will attempt to start and will blow the fuse in your digital multimeter.
- Set the multimeter dial to the DCA (direct current amps) range.
- Plug the red test probe into the red A (Amps) jack, and plug the black test probe into the COM jack.
- To avoid blowing an input fuse, start by setting the range above 10 A.
-12. Loosen the nut (A) on the 12 volt battery negative terminal.
NOTE: Follow the instructions exactly to avoid disconnecting the 12 volt battery ground cable terminal from the 12 volt battery negative terminal.
-13. Connect the red (+) test lead (A) to the 12 volt battery negative terminal (B) of the 12 volt battery ground cable.
-14. Carefully slide the negative terminal of the 12 volt battery ground cable terminal upwards from the 12 volt battery negative terminal post to maintain contact and avoid disconnection. Once enough clearance has been created between the post, connect the black (-) test lead (C) to the 12 volt battery negative terminal post.
-15. Separate the negative terminal (A) of the 12 volt battery ground cable terminal from the 12 volt battery negative terminal.
-16. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA NOTE: If the measured value is over the threshold, wait 10 minutes and recheck.
Is the measured valued less than the threshold?
YES
Intermittent failure, the system is normal at this time.
NO
Go to step 3.
- Electrical equipment check 1
-1. Check if there are any aftermarket electrical accessories installed on the vehicle.
Are there any aftermarket electrical accessories installed?
YES
Go to step 4.
NO
Go to step 6.
- Electrical equipment check 2
-1. Make sure that the aftermarket electrical accessories have been properly installed.
NOTE: Verify that any aftermarket accessories connected to the ACC, IG1, and/or IG2 line are not connected with a +B line.
Are the aftermarket electrical accessories installed correctly?
YES
Go to step 5.
NO
Remove the aftermarket electrical accessories, then recheck.
- Electrical equipment check 3
-1. Disconnect each aftermarket electrical accessories one at a time then repeat the following steps after each one is disconnected.
-2. Make sure the 12 volt battery is fully charged, and that all the vehicle's electrical accessories are turned off.
-3. Turn the vehicle to the ON mode.
-4. Turn the vehicle to the OFF (LOCK) mode.
-5. Get out of the vehicle, and close all doors, in-bed trunk lid, and tailgate securely.
-6. Lock the doors with the keyless remote.
-7. Make sure the individual map lights are turned off, and the security alarm system is armed.
-8. Wait for at least 20 minutes.
-9. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA NOTE: If the measured value is over the threshold, wait 10 minutes and recheck.
Is the measured valued less than the threshold?
YES
Replace, remove, or repair the aftermarket electrical accessories that reduced the parasitic draw to less than the threshold when disconnected.
NO
Go to step 6.
- Parasitic draw check 3
-1. Remove the back-up fuse while the test leads are connected, and measure the parasitic draw.
Threshold of the parasitic draw 14.0 mA Is the measured valued less than the threshold?
YES
Go to step 7.
NO
Go to step 8.
- Parasitic draw check 4
-1. Install the back-up fuse.
-2. Short the B-CAN_H line to B-CAN_L line with a jumper wire while the test leads are still connected to the 12 volt battery.
-3. Turn the vehicle to the ON mode, then the OFF (LOCK) mode.
-4. Get out of the vehicle, and close all doors, in-bed trunk lid, and tailgate securely.
-5. Wait for at least 40 seconds.
-6. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA Is the measured valued less than the threshold?
YES
Disconnect the control units from the B-CAN circuit one at a time, perform step 3-6 above after disconnecting each unit, then measure the parasitic draw. Do the input test for the control unit that reduced the parasitic draw to less than the threshold when disconnected.
NO
Disconnect the control units from the back-up fuse circuit one at a time, perform step 3-6 above after disconnecting each unit, then measure the parasitic draw. Replace the control unit that reduced the parasitic draw to less than the threshold when disconnected.
- Parasitic draw check 4
-1. Remove the +B MAIN fuses while the test leads are still connected to the 12 volt battery.
-2. Make sure the 12 volt battery is fully charged, and that all the vehicle's electrical accessories are turned off.
-3. Turn the vehicle to the ON mode.
-4. Turn the vehicle to the OFF (LOCK) mode.
-5. Get out of the vehicle, and close all doors, in-bed trunk lid, and tailgate securely.
-6. Lock the doors with the keyless remote.
-7. Make sure the individual map lights are turned off, and the security alarm system is armed.
-8. Wait for at least 20 minutes.
-9. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA Is the measured valued less than the threshold?
YES
Identify the parts or harness which excessively consumed current on either the +B MAIN fuses circuits.
NO
Go to step 9.
- Parasitic draw check 5
-1. Install the +B MAIN fuses.
-2. Disconnect under-dash fuse/relay box connector F (18P) while the test leads are still connected to the 12 volt battery.
-3. Measure the parasitic draw.
Threshold of the parasitic draw 27.0 mA Is the measured valued less than the threshold?
YES
Replace the under-dash fuse/relay box .
NO
Repair a short to ground in the wire between the +B MAIN fuses.