Scan Tool Connecting and Initial Checks (Function 01)
VAG1551 Scan Tool (ST), connecting; A/C control head -E87-, checking version
- Battery Voltage OK
- Fuse 22 (S22) OK
- Ground (GND) connection on engine and transmission OK
- With ignition switched off, connect VAG1551 (VAG1552) scan tool to 16-pin Data Link Connector (DLC) under dash to left of steering column, using adapter cable VAG1551/3.
Indicated on display 1)
V.A.G ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer
2 - Blink code output
1) Operating modes 1 and 2 are displayed alternately
- Switch on printer with -PRINT- button (indicator lamp in switch will light up).
- Switch on ignition or start engine.
- Switch A/C compressor on (press "AUTO" button).
- Press button -1- for operating mode "Rapid data transfer."
Indicated on display
Rapid data transfer HELP
Enter address word XX
NOTE:
If display is blank, check wiring to VAG1551/power supply using Troubleshooting Procedure No.1 in "Electrical Wiring Diagrams, Troubleshooting and Component Locations" Manual.
- Additional operating instructions can be obtained by pressing the HELP button on VAG1551 Scan Tool (ST)
- During testing procedures, the -> button advances the program to the next step
- An incorrect entry can be cancelled with the -C- button
Address word for A/C Heating Electronics: 08
- Press buttons -0- and -8-.
Indicated on display
Rapid data transfer Q
08 - A/C Heating Electronics
- Press -Q- button to confirm input.
If one of the following messages is displayed:
Indicated on display
Rapid data transfer HELP
Control module does not answer
or
Indicated on display
Rapid data transfer HELP
K wire not switching to B+
- Press HELP button to print out list of possible causes.
Rapid data transfer ->
No signal from control module
- Check wiring to Data Link Connector (DLC) according to wiring diagram
If this display appears at the beginning of or during the OBD program, malfunctions have occurred and data transfer is no longer possible between the VAG1551 Scan Tool (ST) and the A/C control head -E87-.
Rapid data transfer ->
Error in communication link
- Check wiring to DLC.
Rapid data transfer Q
08 - A/C Heating Electronics
- After repairing possible causes of the malfunction, press buttons -0- and -8- to insert "AC/Heating Electronics" address word 08.
- Press -Q- button to confirm input.
Indicated on display
Rapid data transfer
Scan Tool sends address word 08
Indicated on display after approx. 5 seconds
8D0820043D A4-Klimavollautomat DXX
-> Coding 00082 WSC ZZZZZ
- 8D0 820 043 D: Part Number of A/C control head -E87-
- A4: A/C Heating Electronics component designation
- DXX: Software version of A/C control head -E87-
- Coding: 00062
- WSC 06812: Dealership code
Readout example shows US/CDN version, Zexel A/C compressor, 6 cylinder gasoline engine
Coding -E87- and code tables. Testing and Inspection
For m.y. 1997 vehicles install only A/C control head -E87- with Part No. 8L0 820 043 up to and including Part No. index letter "C."
8L0 820 043B A4-A/C fully automatic DXX
Coding XXXXX WSC ZZZZZ
For vehicles beginning my. 1998 install only A/C control head -E87- with Part No. 8L0 820 043 from Part No. index letter "D."
8L0 820 043D A4-A/C fully automatic DXX
Coding XXXXX WSC ZZZZZ
CAUTION!
Part numbers are listed here for reference only. Always check with your Parts department for the latest information
NOTE:
- Zexel A/C compressors were installed from start of production. During m.y. 1996, Nippondenso type compressors are installed as a running change. These compressors are not equipped with A/C speed sensor G111.
- The A/C control head is coded to reflect the compressor type installed (Zexel or Nippondenso).
- Vehicles equipped with Nippondenso (Denso) compressors must have A/C control head with Part No. index "H" or higher installed to allow for correct coding.
- Follow coding exactly when replacing an A/C control head -E87-.
- A/C control head varies after VIN 200000 of m.y. 1999 for vehicles with and without radio navigation system (or a radio with a large control panel), with and without switch for heated seats (e.g. index "M", "N", "P" or
- Depending on VAG1551 Scan Tool (ST) program card version, 1st and 2nd digit may not be displayed (readout: e.g. 040 instead of 00040).
- Software version of control head is of no significance for service department.
- If a replacement control head is not coded after installation or if an unrecognized code was entered, code "00042" (4-cyl. gasoline engine USA) is stored.