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:
- 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 switch 2P connector.
- 3. Connect the security hood 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 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. Wait for at least 20 minutes.
- 10. Attach the LH41 AC/DC low current clamp meter (A) to the 12 volt battery ground cable (B). Follow the equipment manufacturer's instructions, then measure the parasitic draw.
NOTE: If you are using a digital multimeter: go to step 2.
- 11. Measure the parasitic draw.
12 volt battery size Threshold of the parasitic draw 44B19 20.0 mA Is the measured valued less than the threshold?
YES
Intermittent failure, the system is normal at this time.
NO
Go to step 2.
- Parasitic draw check 2:
NOTE: If LH AC/DC low current clamp meter (FLULH41A) is not available, do the follow procedure.
- 1. Check the following items before measuring:
- 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.
- 2. 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.
- 3. Connect the red (+) test lead (A) to the negative terminal (B) of the 12 volt battery ground cable.
- 4. Carefully slide the negative terminal of the 12 volt battery ground cable upwards from the 12 volt battery negative terminal post to maintain contact and avoid disconnection. Then connect the black (-) test lead (C) to the 12 volt battery negative terminal post.
NOTE: If disconnection occurs, this could give you erroneous readings.
- 5. Disconnect the negative terminal (A) of the 12 volt battery ground cable from the 12 volt battery negative terminal.
- 6. Measure the parasitic draw.
12 volt battery size Threshold of the parasitic draw 44B19 20.0 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:
Check if there are any aftermarket electrical accessories installed on the vehicle.
Are there any aftermarket electrical accessories installed?
YES
Remove any installed aftermarket accessories and do parasitic draw tests again.
NO
Go to step 4.
- Parasitic draw check 2:
Remove the back-up fuse while the test leads are connected, and measure the parasitic draw.
12 volt battery size Threshold of the parasitic draw 44B19 9.0 mA Is the measured valued less than the threshold?
YES
Go to step 5.
NO
Go to step 6.
- Parasitic draw check 3:
- 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 connected.
- 3. Turn the vehicle to the ON mode and then the OFF (LOCK) mode.
- 4. Get out of the vehicle and close all the doors.
- 5. Wait for at least 40 seconds.
- 6. Measure the parasitic draw.
12 volt battery size Threshold of the parasitic draw 44B19 20.0 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, 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, then measure the parasitic draw. Replace the control unit that reduced the parasitic draw to less than the threshold when disconnected.
- Parasitic draw check 3:
- 1. With a built-in type MICU: Remove the No. D1-2 (50 A)*1 (30 A)*2 , No. D4 (30 A)*2 fuse(s) in the auxiliary under-dash fuse box while the test leads are connected.*1: Without keyless access system*2: With keyless access system
- 2. With a separate type MICU: Remove the No. C25 (50 A)*1 (30 A)*2 , No. C16 (30 A)*2 fuse(s) in the under-dash fuse/relay box while the test leads are connected.*1: Without keyless access system*2: With keyless access system
- 3. Turn the vehicle to the ON mode and then the OFF (LOCK) mode.
- 4. Get out of the vehicle and close all the doors.
- 5. Wait for at least 40 seconds.
- 6. Measure the parasitic draw.
12 volt battery size Threshold of the parasitic draw 44B19 20.0 mA Is the measured valued less than the threshold?
YES
Go to step 7.
NO
Remove the fuses from the auxiliary under-dash fuse box one at a time, and identify the parts which excessively consume current.
NO
If all electrical circuits are OK, check the starter system circuit.
NO
Perform the starter performance test.
- Parasitic draw check 4:
- 1. With a built-in type MICU: Install the No. D1-2 (50 A)*1 (30 A)*2 , No. D4 (30 A)*2 fuse(s) in the auxiliary under-dash fuse box.*1: Without keyless access system*2: With keyless access system
- 2. With a separate type MICU: Install the No. C25 (50 A)*1 (30 A)*2 , No. C16 (30 A)*2 fuse(s) in the under-dash fuse/relay box.*1: Without keyless access system*2: With keyless access system
- 3. Remove the ignition switch*1 or under-dash subrelay box*2 while the test leads are connected, and measure the parasitic draw.*1: Without keyless access system*2: With keyless access system
12 volt battery size Threshold of the parasitic draw 44B19 20.0 mA Is the measured valued less than the threshold?
YES
Replace the ignition switch (without keyless access system) or the under-dash subrelay box (with keyless access system) .
NO: Without keyless access system
Repair a short to ground in the wire between the No. D1-2 (50 A) fuse in the auxiliary under-dash fuse box and the ignition switch.
NO: With keyless access system
Repair a short to ground in the wire between the No. D1-2 (30 A) fuse in the auxiliary under-dash fuse box and under-dash subrelay box.
NO: With keyless access system
Repair a short to ground in the wire between the No. D4 (30 A) fuse in the auxiliary under-dash fuse box and under-dash subrelay box.