Automatic Climate Control system, On-Board Diagnostic (OBD)

Diagnostic Trouble Code (DTC) Table

NOTE:
- The tables below provide a summary of all the DTCs which can be detected by the A/C Control Head -E87- and displayed on the VAG 1551 Scan Tool (ST). The DTCs are listed according to their 5-digit numbers.
- If malfunctions occur only occasionally or if DTC memory was not erased after repairs, these DTCs are displayed as "sporadic." The contents of DTC memory are retained until erased (permanent memory).
- DTCs and blink codes (only in the case of individual components) appear only in the printout in operating mode -1- "Rapid data transfer."

Example:

DTC Blink code
5-digit 4-digit
00532 2232

- The malfunction type may also appear in the DTC table below the relevant component.
- After repairs, DTC memory must always be checked again and erased using the VAG 1551 Scan Tool (ST).
- Before replacing components, always check the relevant positive and Ground (GND) connections (terminals 15, 75, 30 and 31), as well as all harness connectors (between the A/C Control Head -E87- and the component indicated as being faulty) according to the wiring diagram.
- When dealing with any sporadic DTCs, always pay attention to possible loose terminals in harness connectors.
- After replacing a component of the heating and air conditioning system, always perform basic setting (function 04) and then check and erase DTC memory (functions 02 and 05).
- Use the VAG 1598/11 adapter and VAG 1598/12 adapter to test the electrical connections of the A/C Control Head -E87- according to the wiring diagram.
- If the A/C Control Head -E87- remains in operation after switching the ignition off, test the wiring to the A/C Control Head-E87- (connector D, terminal 1) for a short circuit to B+ according to the wiring diagram.
- If a malfunction is detected in the potentiometer of one of the air distribution positioning motors, the air distribution can be changed by pressing the buttons on the A/C Control Head -E87-.
- When the convertible top is opened on Audi TT Roadsters, A/C regulation is altered. Instead of using the measured value from instrument panel interior temperature sensor -G56-, the system assumes pre-programmed outlet temperature values based on the current outside temperature. -E87- receives this information via terminal 5 in connector C from convertible top control module - J256-.
- The display is changed from degree C (Celsius) to degree F (Fahrenheit) and vice-versa by pressing the "+" button on the driver's side while simultaneously holding down the recirculated air button.
- If problems have been reported with the heating and air conditioning system but no malfunctions can be detected, perform output Diagnostic Test Mode (DTM) function 03 and Read Measuring Value Block function 08.
- Testing the cooling performance of the air conditioning.