Heated Seats, Checking

Heated Seats, Checking

NOTE:
- Situations preventing activation of drivers/front passengers seat heating (short circuit in connection to seat heating element, open circuit in power supply to Climatronic Control Module J255) are stored as DTCs in Climatronic Control Module J255 "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051.
- Checking actuation of heated seat operation is described in Guided Fault-Finding for air conditioner "Guided Fault- Finding" function of Diagnostic Operation System VAS 5051.
- Situations preventing activation of rear seat heating (short circuit in connection to seat heating element, open circuit in power supply to Rear A/C Control Head (Climatronic) E265) are stored as DTCs in Rear A/C Control Head (Climatronic) E265 "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051.
- If voltage measured at Energy Management Control Module J644 at terminal "30" drops below value stored in Energy Management Control Module J644, seat heating power is reduced (at present to approx. 50%) or heating is completely deactivated to relieve load on alternator (electronics system of Climatronic Control Module J255 or Rear A/C Control Head (Climatronic) E265 reduces actuation duty cycle from 100% to 90....0%) "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051.
- Measured value block of Climatronic Control Module J255 shows that front seat heating is on or indicates why there is no actuation in spite of corresponding request (display groups "027", "028", "033", "034" and "035") "Guided Fault- Finding" function of Diagnostic Operation System VAS 5051.
- Measured value block of Rear A/C Control Head (Climatronic) E265 shows that rear seat heating is on or indicates why there is no actuation in spite of corresponding request (display groups "004", "005", "007" and "008"). Climatronic Control Module J255 indicates that rear seat heating has been deactivated, e.g. on account of electrical system overload (display group "049") "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051.