| HLK | 0101 | Overvoltage at operating unit HLK |
| HLK | 0102 | Undervoltage at operating unit HLK |
| HLK | 0110 | Internal fault in operating unit HLK |
| HLK | 0111 | Operating unit HLK is incorrectly configured. |
| HLK | 0112 | Operating unit HLK is incorrectly parameterized. |
| HLK | 0140 | Reference voltage for position potentiometer of servodrives has Short circuit to ground. |
| HLK | 0141 | Reference voltage for position potentiometer of servodrives has Short circuit to positive. |
| HLK | 0160 | Operating unit detects 'Bus OFF' at vehicle CAN bus. |
| HLK | 0161 | Communication between operating unit and vehicle CAN bus is interrupted. |
| HLK | 0162 | Operating unit detects 'Bus OFF' at heating CAN bus. |
| HLK | 0164 | No or incorrect CAN message from control unit MTS Modular door control system |
| HLK | 0312 | Substation 1 is incorrectly parameterized. |
| HLK | 0363 | Heating CAN bus: communication with substation 1 is interrupted. |
| HLK | 0412 | Substation 2 is incorrectly parameterized. |
| HLK | 0463 | Heating CAN bus: communication with substation 2 is interrupted. |
| HLK | 1130 | Servomotor for water valve for front floor has Open circuit. |
| HLK | 1131 | Servomotor for water valve for front floor has Short circuit to ground. |
| HLK | 1132 | Servomotor for water valve for front floor has Short circuit to positive. |
| HLK | 1133 | Servo motor for water valve for front floor has a positioning fault. |
| HLK | 1230 | Servomotor for fresh air and recirculated air flap has Open circuit. |
| HLK | 1231 | Servomotor for fresh air and recirculated air flap has Short circuit to ground. |
| HLK | 1232 | Servomotor for fresh air and recirculated air flap has Short circuit to positive. |
| HLK | 1233 | Servo motor for fresh air and recirculated air flap has a positioning fault. |
| HLK | 1330 | Servomotor for water valve for front box has Open circuit. |
| HLK | 1331 | Servomotor for water valve for front box has Short circuit to ground. |
| HLK | 1332 | Servomotor for water valve for front box has Short circuit to positive. |
| HLK | 1333 | Servo motor for water valve for front box has a positioning fault. |
| HLK | 1430 | Servomotor for windshield flap at front box has Open circuit. |
| HLK | 1431 | Servomotor for windshield flap at front box has Short circuit to ground. |
| HLK | 1432 | Servomotor for windshield flap at front box has Short circuit to positive. |
| HLK | 1433 | Servo motor for windshield flap at front box has a positioning fault. |
| HLK | 1530 | Output for compressor clutch has Open circuit. |
| HLK | 1531 | Output for compressor clutch has Short circuit to ground. |
| HLK | 1532 | Output for compressor clutch has Short circuit to positive. |
| HLK | 1630 | Output for auxiliary heater has Open circuit. |
| HLK | 1631 | Output for auxiliary heater has Short circuit to ground. |
| HLK | 1632 | Output for auxiliary heater has Short circuit to positive. |
| HLK | 1730 | Output for auxiliary heater economy stage has Open circuit. |
| HLK | 1731 | Output for auxiliary heater economy stage has Short circuit to ground. |
| HLK | 1732 | Output for auxiliary heater economy stage has Short circuit to positive. |
| HLK | 1830 | Output for water pump has Open circuit. |
| HLK | 1831 | Output for water pump has Short circuit to ground. |
| HLK | 1832 | Output for water pump has Short circuit to positive. |
| HLK | 1930 | Output for passenger compartment blower of front vehicle, stage 1, has Open circuit. |
| HLK | 1931 | Output for passenger compartment blower of front vehicle, stage 1, has Short circuit to ground. |
| HLK | 1932 | Output for passenger compartment blower of front vehicle, stage 1, has Short circuit to positive. |
| HLK | 2030 | Output for passenger compartment blower of front vehicle, stage 2, has Open circuit. |
| HLK | 2031 | Output for passenger compartment blower of front vehicle, stage 2, has Short circuit to ground. |
| HLK | 2032 | Output for passenger compartment blower of front vehicle, stage 2, has Short circuit to positive. |
| HLK | 2130 | Output for fault lamp has Open circuit. |
| HLK | 2131 | Output for fault lamp has Short circuit to ground. |
| HLK | 2132 | Output for fault lamp has Short circuit to positive. |
| HLK | 2230 | Output for activating the substations has Open circuit. |
| HLK | 2231 | Output for activating the substations has Short circuit to ground. |
| HLK | 2232 | Output for activating the substations has Short circuit to positive. |
| HLK | 2330 | Output for timer (remote pushbutton) has Open circuit. |
| HLK | 2331 | Output for timer (remote pushbutton) has Short circuit to ground. |
| HLK | 2332 | Output for timer (remote pushbutton) has Short circuit to positive. |
| HLK | 2430 | Pulse width modulated output for front box blower has Open circuit. |
| HLK | 2431 | Pulse width modulated output for front box blower has Short circuit to ground. |
| HLK | 2432 | Pulse width modulated output for front box blower has Short circuit to positive. |
| HLK | 2520 | Room temperature sensor has Open circuit. |
| HLK | 2521 | Room temperature sensor has Short circuit to ground. |
| HLK | 2522 | Room temperature sensor has Short circuit to positive. |
| HLK | 2523 | Room temperature sensor has Sensor fault. |
| HLK | 2620 | Outlet temperature sensor for floor has Open circuit. |
| HLK | 2621 | Outlet temperature sensor for floor has Short circuit to ground. |
| HLK | 2622 | Outlet temperature sensor for floor has Short circuit to positive. |
| HLK | 2720 | Ambient temperature sensor has Open circuit. |
| HLK | 2721 | Ambient temperature sensor has Short circuit to ground. |
| HLK | 2722 | Ambient temperature sensor has Short circuit to positive. |
| HLK | 2820 | Outlet temperature sensor at driver position has Open circuit. |
| HLK | 2821 | Outlet temperature sensor at driver position has Short circuit to ground. |
| HLK | 2822 | Outlet temperature sensor at driver position has Short circuit to positive. |
| HLK | 2920 | Input for external set value potentiometer has Open circuit. |
| HLK | 2921 | Input for external set value potentiometer has Short circuit to ground. |
| HLK | 2922 | Input for external set value potentiometer has Short circuit to positive. |
| HLK | 3090 | High pressure fault in refrigerant circuit |
| HLK | 3091 | Low pressure fault in refrigerant circuit |
| HLK | 3620 | Input for external set value potentiometer has Open circuit.(PWM blower) |
| HLK | 3621 | Input for external set value potentiometer has Short circuit to ground.(PWM blower) |
| HLK | 3622 | Input for external set value potentiometer has Short circuit to positive.(PWM blower) |
| HLK | 6030 | Substation 1: servomotor for front right roof flap has Open circuit. |
| HLK | 6031 | Substation 1: servomotor for front right roof flap has Short circuit to ground. |
| HLK | 6032 | Substation 1: servomotor for front right roof flap has Short circuit to positive. |
| HLK | 6033 | Substation 1: servo motor for front right roof flap has a positioning fault. |
| HLK | 6130 | Substation 1: servomotor for front left roof flap has Open circuit. |
| HLK | 6131 | Substation 1: servomotor for front left roof flap has Short circuit to ground. |
| HLK | 6132 | Substation 1: servomotor for front left roof flap has Short circuit to positive. |
| HLK | 6133 | Substation 1: servo motor for front left roof flap has a positioning fault. |
| HLK | 6230 | Substation 1: servomotor for water valve for front roof has Open circuit. |
| HLK | 6231 | Substation 1: servomotor for water valve for front roof has Short circuit to ground. |
| HLK | 6232 | Substation 1: servomotor for water valve for front roof has Short circuit to positive. |
| HLK | 6233 | Substation 1: servo motor for water valve for front roof has a positioning fault. |
| HLK | 6330 | Substation 1: servo motor at output X18/5-6 has Open circuit. |
| HLK | 6331 | Substation 1: servo motor at output X18/5-6 has Short circuit to ground. |
| HLK | 6332 | Substation 1: servo motor at output X18/5-6 has Short circuit to positive. |
| HLK | 6333 | Substation 1: servo motor at output X18/5-6 has a positioning fault. |
| HLK | 6430 | Substation 1: output X15/6 has Open circuit. |
| HLK | 6431 | Substation 1: output X15/6 has Short circuit to ground. |
| HLK | 6432 | Substation 1: output X15/6 has Short circuit to positive. |
| HLK | 6530 | Substation 1: output X18/4 has Open circuit. |
| HLK | 6531 | Substation 1: output X18/4 has Short circuit to ground. |
| HLK | 6532 | Substation 1: output X18/4 has Short circuit to positive. |
| HLK | 6630 | Substation 1: output X18/7 has Open circuit. |
| HLK | 6631 | Substation 1: output X18/7 has Short circuit to ground. |
| HLK | 6632 | Substation 1: output X18/7 has Short circuit to positive. |
| HLK | 6730 | Substation 1: output X18/8 has Open circuit. |
| HLK | 6731 | Substation 1: output X18/8 has Short circuit to ground. |
| HLK | 6732 | Substation 1: output X18/8 has Short circuit to positive. |
| HLK | 6830 | Substation 1: output X18/9 has Open circuit. |
| HLK | 6831 | Substation 1: output X18/9 has Short circuit to ground. |
| HLK | 6832 | Substation 1: output X18/9 has Short circuit to positive. |
| HLK | 6930 | Substation 1: output X18/10 has Open circuit. |
| HLK | 6931 | Substation 1: output X18/10 has Short circuit to ground. |
| HLK | 6932 | Substation 1: output X18/10 has Short circuit to positive. |
| HLK | 7030 | Substation 1: output X18/11 has Open circuit. |
| HLK | 7031 | Substation 1: output X18/11 has Short circuit to ground. |
| HLK | 7032 | Substation 1: output X18/11 has Short circuit to positive. |
| HLK | 7130 | Substation 1: pulse width modulated output for front roof ducting blower has Open circuit. |
| HLK | 7131 | Substation 1: pulse width modulated output for front roof ducting blower has Short circuit to ground. |
| HLK | 7132 | Substation 1: pulse width modulated output for front roof ducting blower has Short circuit to positive. |
| HLK | 7220 | Substation 1: outlet temperature sensor for front roof duct has Open circuit. |
| HLK | 7221 | Substation 1: outlet temperature sensor for front roof duct has Short circuit to ground. |
| HLK | 7222 | Substation 1: outlet temperature sensor for front roof duct has Short circuit to positive. |
| HLK | 7320 | Substation 1: front anti-icing sensor has Open circuit. |
| HLK | 7321 | Substation 1: front anti-icing sensor has Short circuit to ground. |
| HLK | 7322 | Substation 1: front anti-icing sensor has Short circuit to positive. |
| HLK | 7420 | Substation 1: front room temperature sensor has Open circuit. |
| HLK | 7421 | Substation 1: front room temperature sensor has Short circuit to ground. |
| HLK | 7422 | Substation 1: front room temperature sensor has Short circuit to positive. |
| HLK | 7423 | Substation 1: rear room temperature sensor has Sensor fault. |
| HLK | 7520 | Substation 1: sensor input X18/17 has Open circuit. |
| HLK | 7521 | Substation 1: sensor input X18/17 has Short circuit to ground. |
| HLK | 7522 | Substation 1: sensor input X18/17 has Short circuit to positive. |
| HLK | 8030 | Substation 2: servomotor for rear right roof flap has Open circuit. |
| HLK | 8031 | Substation 2: servomotor for rear right roof flap has Short circuit to ground. |
| HLK | 8032 | Substation 2: servomotor for rear right roof flap has Short circuit to positive. |
| HLK | 8033 | Substation 2: servomotor for rear right roof flap has Short circuit. |
| HLK | 8130 | Substation 2: servomotor for rear left roof flap has Open circuit. |
| HLK | 8131 | Substation 2: servomotor for rear left roof flap has Short circuit to ground. |
| HLK | 8132 | Substation 2: servomotor for rear left roof flap has Short circuit to positive. |
| HLK | 8133 | Substation 2: servomotor for rear left roof flap has Short circuit. |
| HLK | 8230 | Substation 2: servomotor for water valve for rear roof has Open circuit. |
| HLK | 8231 | Substation 2: servomotor for water valve for rear roof has Short circuit to ground. |
| HLK | 8232 | Substation 2: servomotor for water valve for rear roof has Short circuit to positive. |
| HLK | 8233 | Substation 2: servomotor for water valve for rear roof has Short circuit. |
| HLK | 8330 | Substation 2: servomotor for water valve for rear floor has Open circuit. |
| HLK | 8331 | Substation 2: servomotor for water valve for rear floor has Short circuit to ground. |
| HLK | 8332 | Substation 2: servomotor for water valve for rear floor has Short circuit to positive. |
| HLK | 8333 | Substation 2: servomotor for water valve for rear floor has Short circuit. |
| HLK | 8430 | Substation 2: output for condenser blower has Open circuit. |
| HLK | 8431 | Substation 2: output for condenser blower has Short circuit to ground. |
| HLK | 8432 | Substation 2: output for condenser blower has Short circuit to positive. |
| HLK | 8530 | Substation 2: output X18/4 has Open circuit. |
| HLK | 8531 | Substation 2: output X18/4 has Short circuit to ground. |
| HLK | 8532 | Substation 2: output X18/4 has Short circuit to positive. |
| HLK | 8630 | Substation 2: output X18/7 has Open circuit. |
| HLK | 8631 | Substation 2: output X18/7 has Short circuit to ground. |
| HLK | 8632 | Substation 2: output X18/7 has Short circuit to positive. |
| HLK | 8730 | Substation 2: output X18/8 has Open circuit. |
| HLK | 8731 | Substation 2: output X18/8 has Short circuit to ground. |
| HLK | 8732 | Substation 2: output X18/8 has Short circuit to positive. |
| HLK | 8830 | Substation 2: output for compressor clutch has Open circuit. |
| HLK | 8831 | Substation 2: output for compressor clutch has Short circuit to ground. |
| HLK | 8832 | Substation 2: output for compressor clutch has Short circuit to positive. |
| HLK | 8930 | Substation 2: output for passenger compartment blower of rear vehicle, stage 1, has Open circuit. |
| HLK | 8931 | Substation 2: output for passenger compartment blower of rear vehicle, stage 1, has Short circuit to ground. |
| HLK | 8932 | Substation 2: output for passenger compartment blower of rear vehicle, stage 1, has Short circuit to positive. |
| HLK | 9030 | Substation 2: output for passenger compartment blower of rear vehicle, stage 2, has Open circuit. |
| HLK | 9031 | Substation 2: output for passenger compartment blower of rear vehicle, stage 2, has Short circuit to ground. |
| HLK | 9032 | Substation 2: output for passenger compartment blower of rear vehicle, stage 2, has Short circuit to positive. |
| HLK | 9130 | Substation 2: pulse width modulated output for rear roof duct blower has Open circuit. |
| HLK | 9131 | Substation 2: pulse width modulated output for rear roof duct blower has Short circuit to ground. |
| HLK | 9132 | Substation 2: pulse width modulated output for rear roof duct blower has Short circuit to positive. |
| HLK | 9220 | Substation 2: outlet temperature sensor for rear roof duct has Open circuit. |
| HLK | 9221 | Substation 2: outlet temperature sensor for rear roof duct has Short circuit to ground. |
| HLK | 9222 | Substation 2: outlet temperature sensor for rear roof duct has Short circuit to positive. |
| HLK | 9320 | Substation 2: rear anti-icing sensor has Open circuit. |
| HLK | 9321 | Substation 2: rear anti-icing sensor has Short circuit to ground. |
| HLK | 9322 | Substation 2: rear anti-icing sensor has Short circuit to positive. |
| HLK | 9420 | Substation 2: rear room temperature sensor has Open circuit. |
| HLK | 9421 | Substation 2: rear room temperature sensor has Short circuit to ground. |
| HLK | 9422 | Substation 2: rear room temperature sensor has Short circuit to positive. |
| HLK | 9423 | Substation 2: ambient temperature sensor in roof has Sensor fault. |
| HLK | 9520 | Substation 2: outlet temperature sensor for rear floor has Open circuit. |
| HLK | 9521 | Substation 2: outlet temperature sensor for rear floor has Short circuit to ground. |
| HLK | 9522 | Substation 2: outlet temperature sensor for rear floor has Short circuit to positive. |