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roybelding
roybelding, ASE Master Tech
Category: Mazda
Satisfied Customers: 4643
Experience:  40 years experience ASE master tech
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2008 Mazda3 battery dies after a day or two of car sitting.

Customer Question

2008 Mazda3 battery dies after a day or two of car sitting. Replaced battery, same problem. Alternator charging at 14.5 volts. Performed parasitic load test and had 140 mA which dropped to 20 mA after about 30 minutes (modules went to sleep). However, when the door is locked (using key in door as driver and passenger door lock actuators do not work), the mA will stay at 220 even after several hours.
Submitted: 11 months ago.
Category: Mazda
Expert:  roybelding replied 11 months ago.

good morning my name is ***** ***** I will assist

try disconnecting the actuators and see if the draw still exists. the module may be trying to activate the actuators until they respond.

I would try this first

Roy

Customer: replied 11 months ago.
I will give this a try and let you know.
Expert:  roybelding replied 11 months ago.

ok

Customer: replied 11 months ago.
I unplugged the driver door actuator and then switched the door to the closed position. The door lock button on remote no longer works but the door unlock button still does, however my milliamps reading is now at 320.
Expert:  roybelding replied 11 months ago.

did you do both front??? you stated both did not work

Roy

Customer: replied 11 months ago.
Just driver side. I will remove passenger side actuator connector and advise. I have a feeling this is going to be a PJB issue (passenger fuse block with integrated relays and microprocessors).
Expert:  roybelding replied 11 months ago.

it may be. in that case you may have to satrt pulling fuses until the draw drops.

Roy

Customer: replied 11 months ago.
I previously pulled all the fuses and relays that were removable and still had high milliamp reading. Then I unbolted the 40 amp BTN fuse and my milliamp draw went down to 20. The only things on the circuit that that 40 amp fuse protects in and of itself is the microcomputer in the passenger junction box and the TNS relay in the passenger junction box.
Expert:  roybelding replied 11 months ago.

ok, did you pull the relay for the tns and re check??

Roy

Customer: replied 11 months ago.
Just disconnected passenger door harness, no difference.
Customer: replied 11 months ago.
TNS relay is not serviceable.
Expert:  roybelding replied 11 months ago.

then I would remove the connector from the back of the fuse box.

Roy

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