GRA Installation Problems

Hi there,

I've been trying all day to replace the GRA (glow plug relay) in my Arosa 1.7 SDI.
to put into operation.

I think I have the wrong PIN assignments: 44 (Reset), 45 (Set), 46 (ON), and 14 (power supply +5V).

The GRA (Gas Recirculation) is already active. VAG-COM indicates 0.0, which means the GRA is present.

Does anyone have any ideas about which PINs are correct, or any other tips?

Best regards,

or

Until next time,

or

See you,

Werner.

Hello!

I identified the correct connections myself (by working from the rear, accessing them through the connector plugged into the control unit / by pushing the sealing plug out from the rear beforehand).

1. Using my multimeter and a 220 V / 7w light bulb as a series resistor (690 ohms when cold), I initially checked the unconnected inputs on the control unit against ground. I was able to exclude all contacts that had 5, 7.5, or 12 V as potential contacts for triggering.

2. Then I went through the remaining (unassigned) contacts with the resistor, this time against 2 volts and without a multimeter. In parallel, I checked the switching status with VAG-COM and monitored field 3 in measurement value block 6, keeping it at 000001 (GRA=ON).

3. Now, I have connected the black wire to terminal 15 (switched positive) on the steering column switch, and the white wire to the contact point I just identified.

4. Now set GRA to ON and, as described in step 2, search for the set and reset points while observing the VAG-COM readings.

Here's the meaning of the VAG-COM codes in field 3 of the MWB6 data.

000000 Cruise control off.
000001 Cruise control on.
000101 Button pressed.
001001 RES Position
100001 Clutch engaged.
010001 Brake applied.

I haven't figured out the PIN number myself yet. However, I will find out and post it here.

Best regards,

or

Until next time,

or

See you,

WVG