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 trunk 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.
Battery size Threshold of the parasitic draw L3 27.0 mA 70D23 36.0 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:
NOTE: If LH AC/DC low current clamp meter (FLULH41A) is not available, do the follow procedure with a digital multimeter
- 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 12 volt battery ground cable terminal (B).
- 4. Carefully slide the 12 volt battery ground cable terminal 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.
- 5. Disconnect the 12 volt battery ground cable terminal (A) from the 12 volt battery negative terminal.
- 6. Measure the parasitic draw.
NOTE: If the measured value is over the threshold, wait 10 minutes and recheck.
Battery size Threshold of the parasitic draw L3 27.0 mA 70D23 36.0 mA Is the measured valued less than the threshold?
YES
Intermittent failure, the system is normal at this time.
NO
Go to step 3.
- Electrical equipment check
- 1. 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 3
- 1. Remove the No. A29 (10 A) fuse in the under-hood fuse/relay box while the test leads are connected, and measure the parasitic draw.
Battery size Threshold of the parasitic draw L3 14.0 mA 70D23 22.0 mA Is the measured valued less than the threshold?
YES
Go to step 5.
NO
Go to step 6.
- Parasitic draw check 4
- 1. Install the No. A29 (10 A) fuse in the under-hood fuse/relay box.
- 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.
Battery size Threshold of the parasitic draw L3 27.0 mA 70D23 36.0 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 42 mA or less 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 42 mA or less when disconnected.-
- Parasitic draw check 4
- 1. Remove the No. A2-1 (30 A) and No. A2-5 (30 A) fuses in the under-hood fuse/relay box while the test leads are connected.
- 2. Turn the vehicle to the ON mode and then the OFF (LOCK) mode.
- 3. Get out of the vehicle and close all the doors.
- 4. Wait for at least 40 seconds.
- 5. Measure the parasitic draw.
Battery size Threshold of the parasitic draw L3 27.0 mA 70D23 36.0 mA Is the measured valued less than the threshold?
YES
Remove the No. A2-1 (30 A) and No. A2-5 (30 A) fuses in the under-hood fuse/relay box one at a time, and identify the parts which excessively consume current.
NO
Go to step 7.
- Parasitic draw check 5
- 1. Install the No. A2-1 (30 A) and No. A2-5 (30 A) fuses in the under-hood fuse/relay box.
- 2. Disconnect under-dash subrelay box connector A (2P) while the test leads are connected, and measure the parasitic draw.
Battery size Threshold of the parasitic draw L3 27.0 mA 70D23 36.0 mA Is the measured valued less than the threshold?
YES
Replace the under-dash subrelay box .
NO
If all electrical circuits OK, Check starter system circuit. Perform starter performance test.
NO
If starter circuit OK, disconnect alternator battery connection, to identify if alternator fault.