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
  • Home
  • Questions
  • 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: Car won't turn over

The battery should be load tested by a professional. Load testing can only be reliably performed on a fully charged battery. If the battery passes a load test be sure it is NOT a marginal pass in which case you...

Q: How do you use the Auxiliary jack on the audio system for the Ford Fusion?

Your car is equipped from the factory to let you connect other devices to your radio. The Auxiliary jack lets you connect things like an external CD player, or even an MP3 player to the radio – any device that...

Q: Blinker bulb lights but doesn't blink

Hi There, What you are describing sounds like a bad turn signal flasher. The flasher unit is an electrical unit that is usually located under the hood and is wired with the turn signal lights. This flasher sends short intermittent...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...