Skip the auto shop - Our mechanics make house calls

Q: What is the function of the auxiliary battery? How is it related to the intelligence servo module?

asked by on

I replaced the ISM ONLY about six months ago and now it is bad. What could be the problem?

My car has 110000 miles.
My car has an automatic transmission.

Hello - these two components are unrelated. The principle function of the secondary battery is as a backup for the primary battery - for the Sensotronic Brake System, which uses electronic pumps for brake pressure to each wheel - not hydraulic fluid pressure from a master cylinder powered by the drivers foot. The Intelligent Sensor Module is an interface on the automatic transmission that translates "gearshift selection" requests from the driver (which are electronic in this vehicle) and translates them to physical gear selection in the transmission.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What is the function of the auxiliary battery? How is it related to the intelligence servo module?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: A/C will not put out cold air.

Hi and thank you for contacting YourMechanic. These AC system are very sensitive and if the pressure isn't tested with the correct gauge and gives and incorrect reading, this will affect how well the system works. I highly recommend that...

Q: Need to find the location on the vehicle of TPMS ECU

Hello, and thank you for writing in. There is likely another fuse box on the inside of the cabin at the passenger floorboard. Check there first. Then you can check next to the fuses below the steering column buy the...

Q: How do I use the USB memory port?

You can enjoy music from your favorite portable device through the speakers in the car by using the USB memory. Push the lid below the radio display. Open up the cover where you’ll find a connection for a USB...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.