My DIC is displaying this msg now... What in the world does it mean? When will it go off, or how do I fix it?

Thanks in advance for your help!
Sean

 

This usually happens if you begin driving in a turn. It has always just gone away after I drive a little ways. If it is staying on I would say you have something else going on.

 

replace your AIT censor. it is located in the air bridge. when these go out they will read incorrect. The computer thinks it is very cold outside so it activates the warming up option.

 

My 02 performs this operation every now and then just after start up too.

 

A little more detail that will probably assist in answering this question, I am also getting a "check engine" light and the codes that its pulling are: (P0113) IAT Sensor Circuit High Voltage & (P1111) IAT Sensor Circuit Intermittent High Voltage. Does this help? Also what do I do about the IAT sensor code? How do I fix that as well?

Thanks guys for your fast responses, and yes it does it right when it starts up and goes off about 20 minutes into driving. But its done it the past six times I've gotten in it.

Sean

 

IS NORMAL! read your manual.

 

He says it is coming on every time he starts the car. That's not normal. I owned two C5s and probably only saw this warning twice in three years.

 

You have AIT sensor codes. That is the sensor on the air bridge that tells your car what temp the air is going in the engine. If the sensor is not reading, it will show like -36 degrees. Thats why your car wants to warm up the active handling.

Fix.

The sensor is probably still good, the problem is the connector that plugs into the sensor has a loose wire in it. Unplug the sensor and check the connection on it. It is probably not making a good contact in the connector. 5 min fix

Good luck

 

Just so you know what it means it is mentioned in 2 places (1) Cold Ambient and (2) Centering in the article listed below:

Active Handling Warming Up Excerpted from a 1998 SAE Paper; Chevrolet C5 Corvette Vehicle Dynamic Control System; Authored by Dick Hoffman and Michael Rizzo of the General Motors Luxury Car Group.

COLD AMBIENT - The thermal gradient of the engine compartment was measured at various ambients to establish the time it took for the hydraulic modulator to become warm and capable of full pressure response. When the vehicle is first started in cold weather and driven forward (>10 kph), the passenger zone module (PZM) monitors the engine intake air and coolant temperatures. The PZM contains software logic to determine if the hydraulics are cold <=-10C), and if cold, the cluster is instructed to display the message" Active Handling Warming-up". The system is functional but the first cycle performance can be affected until the next message "Warm-up complete" is displayed. Traction control and ABS actuations prior to Active Handling actuations will improve the cold hydraulic performance.

VEHICLE SPIN DETECTION - The AH detects a spin, defined as when the slip angle is greater than 90 degrees. Once spin has been detected the AH is inhibited for whichever comes first of the following conditions: (1) Ten (10) second time interval has elapsed. (2) If the spinout results in reference velocity = 0 (due to vehicle stopped). The system does not wait 10 sec to initiate control if the vehicle travels forward.

SYSTEM INITIALIZATION I SENSOR CENTERING

The yaw rate sensor and steering wheel angle sensor must be centered after each ignition off-on cycle. AH will not function until centering has occurred.

CENTERING - The steering wheel angle sensor is centered every ignition off-on cycle This creates a more complex control algorithm but offers significant logistical advantages at the vehicle assembly plant and vehicle service centers. The Corvette assembly plant does not have to communicate with AH to assure centering. Service centers making repairs to the suspension, steering or replacing the steering sensor, do not have to communicate to the AH system. The AH system requires that the vehicle be driven while the system completes the centering routine.
The yaw rate sensor centers quickly if the vehicle is stationary or driven in a straight line. The yaw rate centering time increases with steering inputs >20 degrees or when the vehicle ignition is cycled to crank while the vehicle is moving.
The steering wheel angle sensor has a digital and analog signal output to the electronic control module (ECU). The AH centering algorithm uses the last "centered" analog value from the previous ignition cycle to quickly center the digital steering wheel angle value. The first ignition cycle at the car plant or after the ECU has been disconnected for several hours during service will require the longest time to center. The digital steering wheel angle value is put through a sanity check to make sure that the centering value is accurate. A sanity check requires driving the vehicle in a straight line after ignition off-on. The time for the sanity check increases with steering inputs
.+-20 degrees.
INITIALIZATION - Under normal driving conditions the yaw rate and steering angle sensors will be centered and the AH system initializes within seconds after driving the vehicle forward. However, if for some reason, one or more sensors have not centered and the driver has exceeded 20 kph for a period of time, the PZM will command the DIC message displayed "Active Handling Warming Up", and a icon will be illuminated. This message can be acknowledged and erased from the display. When the centering conditions have been completed the next message "Warmup Complete" will be momentarily displayed, and the icon turned off. The system is functional. If the system never centers the "Service Active Handling" will be displayed.

Bill

 

You obviously know what your talking about

I just got back from A&A having my new Motor, S/C, Cooling system, etc, etc, etc installed. When I went and picked it up, Andy said I was getting the "A/H Warming Up" light. He said that he didnt have the ability to fix it so I should just go to the dealer. When I went for a ride with his tuner "Charlie" we got it to display the message but it wouldn't throw any codes. Then finally once I got on it, it threw a code and also displayed "Service Active Handling" and "Service Vehicle Soon" The Tech 2 unit said it was a Yaw Sensor problem.. What should I look for?? Would it have anything to do with the motor swap?? I cant see that this CONVENIENTLY hapened right after the work, so I would assume it happened when everything was done. Could something not be connected?? The last thing I want to do is go roll up to the dealer and have them charge me 800.00 to trace a wiring problem.

THX,
Jeff

BTW, I am sorry about hijacking the thread...

What the he!! should I look for??

 

I've been getting that message since I bought the car...always just cleared it and forgot about it, oh well

 

Ty so much for the help! Noobie, here but mechanilcally inclined just new to the Vette scene. Is the Air Bridge the section between the throttle body and air box with the Corvette Flags on it?

 

And thanks Bill for that very good bit of info, you are awesome!

Sean

 

That is correct that is the air bridge.

 

Check ALL of your vacuum line connections as well. I was getting the EXACT SAME codes and AH Warming Up issue as you......as well as a rough idle. I found that my grommet to the brake booster had a tear in it creating a vacuum leak. I replaced the grommet......fixed the rough idle.....but I also haven't thrown a code or seen the AH Warming up message either.

I had those symptoms for over a month.....consistently. And it's been nearly a month and 1000 miles since I fixed my vacuum leak and they have yet to re-appear!!!!

 

Very cool, I will go & ck that in a minute. Ty!

 

my 99 is doing it now as i had to change my balancing pulley and now they say that the steering wheel and the sencers are not in alinment

 

guess I've been lucky I've only seen it twice and I had the wheels cranked when I went to take off

 

Check for DIC codes if you get the c1283 -87 code, it means the steering wheel sensor is not aligning correctly. AH light will go as soon as you hit 6 mph and stay on--will not clear. If so it is an easy fix. With engine off and power on, disconnect steering sensor switch and measure voltage at center (blue) pin--it should read 2.4 V, when the code is thrown, it is usually 4.8V or .29V. Reposition steering wheel sensor to read 2.4V. I found this fix on the forum 2 years ago and it worked for me and several others.

 

Thats the thing, the DIC is not throwing any codes except on the PCM which are both for the IAT sensor High Voltage. The AH Warming up comes on EVERY time now and stays on for about 20 mins then says "warmup complete" and goes off. The guy @ Corvettes Of Houston said the IAT sensor could have something to do with it but he wants $80 just to diagnose the problem, the money is actually not the problem, its finding the time to drop off my daily driver so he can look at it. Have you vere experienced the IAT sensor high voltage code? If so how did u fix it?
Thanks!
Sean