IHKA Control Module With "Max A/C" Function (64 09 99)

Publication date: 2005-03-01
Reference number: 64 09 99

IHKA CONTROL MODULE WITH "MAX A/C" FUNCTION

TECHNICAL SERVICE BULLETIN

Reference Number(s): SI B 64 09 99, Date of Issue: March 2005

BMW:	E38 (7 Series) produced from 9/99, E39 (5 Series) produced from 9/00
GROUP:	64 - Heating and Air Conditioning

Superceded Bulletin(s): S.I. B64 09 99, Date of Issue: August 2003

NOTE: This Service Information bulletin supersedes S.I. B64 09 99 dated August 2003.

SUBJECT

IHKA Control Module with "MAX A/C" Function

SITUATION

A new Auto Integrated Heating Air Conditioning System (IHKA) control module (with SW 17.0) featuring a new function: "MAX A/C" was introduced.

The new control panel can be distinguished from the original one, by the "MAX A/C" button (located in the upper, right corner), which replaced the "REST" function button.

Fig 1: IHKA Control Module

New IHKA control module with "MAX A/C" function activated.

The following settings of the IHKA system are activated automatically by pressing the "MAX A/C" button:

Temperature of 60°F is set (and displayed) for passenger and driver sides
Air distribution is set to "Face Vents" only, for both sides
Stratification potentiometer is set to "maximum cold" position
Air re-circulation is active (LED turned "ON" at the re-circulation switch)
AC compressor is activated (LED turned "ON" at the compressor switch)
Maximum blower speed is selected (and maintained as long as function is active) on both sides.

IMPORTANT: The IHKA "MAX A/C" function operates only when the outside temperature exceeds 60°F (15°C). The system switches over to recirculated air mode. In this mode, air will only stream from the center ventilation grille at maximum capacity.

The "REST" function (heating of the vehicle while the engine is switched off) is still available with the new IHKA module. The following conditions have to be met for "REST" feature activation:

Ignition switched OFF, or in position 1 (KL R)
"MAX A/C" button pressed
Outside temperature below 60°F
Coolant temperature above 170°F
Battery voltage above 11.4V
Function is active up to 15 minutes after ignition was turned off.

The IHKA SW17.0 module with "MAX A/C" function provides great customer benefit by allowing them to set the air conditioning system more conveniently.

However, as a running production change, it is not intended to be used for "upgrading of customer vehicles" under the BMW New Car Limited warranty.

WARRANTY INFORMATION

For information only.