IHKA Temperature Setting Not Adjustable (64 07 05)

Publication date: 2005-08-01
Reference number: 64 07 05

IHKA TEMPERATURE SETTING NOT ADJUSTABLE

TECHNICAL SERVICE BULLETIN

Reference Number(s): SI B64 07 05, Date of Issue: August 2005

BMW:	E85 (Z4) with IHKA (SA 534)
GROUP:	64 - Heating and Air Conditioning

SUBJECT

IHKA Temperature Setting not Adjustable

SITUATION

The customer states that during heating operation, cold air comes out of the vents in all temperature settings, except maximum heat (temperature knob turned to the red scale).

CAUSE

IHKA (Automatic Heating and Air Conditioning) coding.
IHKA control module faulty.

PROCEDURE

Verify the customer complaint by first running the vehicle to full operating temperature.
Set the temperature control knob to the white scale (64 to 80).
Does the temperature regulation work correctly?
If no, turn the temperature control knob clockwise to the red scale (full heat, no mixing flap).
If full heat is now coming from the vents, continue with the next step. If not, then the procedure outlined in this Service Information will not repair the problem. Continue troubleshooting the system.
Recode the IHKA control module per SI B09 05 01 (Coding, Individualization, Programming) Procedure E, using CIP 18.01 or higher.
Recheck the system as in steps 1 - 4 above. If the heating still does not work properly, replace the IHKA control panel.

WARRANTY INFORMATION

Covered under the terms of the BMW New Vehicle Limited Warranty.

Refer to KSD