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Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 20944
Experience:  Automotive Engineer for 20 years, BEng hons degree,
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The battery in my key went flat, replaced battery and now

Customer Question

The battery in my key went flat, replaced battery and now security system is locked on and nothing in car is working
JA: How many miles are on the car? Has this ever happened before?
Customer: Less than 100000 kms and not that I recall
JA: What is the model of your '98000 Nissan?
Customer: 09 Nissan Maxima j32
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes as need car today and all service centres are closed. Placed fob key in and tried starting not sure what else to do. I was told maybe the key needs to be refigured to the car.
JA: Anything else you think the mechanic should know?
Customer: No
Submitted: 6 months ago.
Category: Australia Car
Expert:  Matt replied 6 months ago.

Hello

I'd try resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.

This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.

This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm

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Expert:  Matt replied 6 months ago.

Hi

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