Z16SE: cod eroare P1530

It`s Lamda1 conector......not relevant for this problem.

I'm almost sure one of the cables going to the AC relay is interrupted somewhere, making intermittent contact and thus behaving the way you described. You could ring the wires with a multimeter to find the faulty one and replace it, but it won't be trivial. Unfortunately I don't have a schematic diagram of the car, it would have been far easier to identify the points which cause the intermittent behavior.

Their number isn't that high once you look on the schematic. The main problem is the cumbersome access to check them. If someone could share the schematic related to AC control, I can definitely help you identify wiring's functionality.

Reduced to a minimum, the AC system works as following:
-> the clutch needs +12V and GND to be switched on by a relay;
-> clutch command relay also needs +12V and GND to be activated. Its coil voltage is controlled either by some stupid switch inside the car (manual AC, as in my ancient Corsa) or by the HVAC ECU (automatic AC, as you have). Without a schematic I can only tell the possibilities to command the relay:
a) one coil pin permanently connected to GND, one switched to +12V;
b) one coil pin permanently connected to +12V, one switched to GND;
c) both coil pins connected in the same time, one to +12V and one to GND.
The most plausible is a), but I don't like to work on assumptions.

Since you already shorted relay's contacts commanding the clutch and you got the compressor working after that, it is obvious that the high power side works properly and the defect is somewhere in the command part. This means the relay, one of the wires from relay control, or the HVAC ECU itself are defective. Or all in the same time, but I don't think you're THAT unlucky.

In order to find the issue and fix it, you need to identify the wires connected to relay's coil and where these are connected to HVAC ECU. Once you identified them, turn AC on and then measure the voltage between the wires going from ECU to coil on both ECU out and the coil. You can get one of the following situations:
1. No voltage at ECU = faulty ECU;
2. Voltage at ECU but nothing on the coil = broken wire / bad plug contact (can be on +12V, GND or both wires);
3. Voltage on the coil, but clutch off = 100% faulty relay.

However, since you noticed intermittent behavior when fiddling with the wires, I'd say the most likely cause is nr. 2. I hope it helps.

Of course I read the entire topic, that's how I understood you don't get any control voltage on the relay and then posted a way to find out the problem.

Any ideas, dear friends?

Thank you gezak, but that is for Astra G, I'm looking for Vectra C diagrams.

Poate sunt eu mai conservator...,dar pe un forum englezesc,nu vin eu si scriu in romaneste avind pretentia ca toti englezii sa scrie in romaneste...,e o chestie de bun simt! Ai intrat pe un forum romanesc,scrii in romaneste(te ajuta Google!)! ... P1530 A/C Relay Voltage Low Heating, Vent
P1530 A/C Relay Voltage High Heating, Ventilation and Air Con ilation and Air ...! Probleme cu comanda releului respectiv,cu plus sau cu minus,verificarea va stabili exact,dupa care se va face pasul urmator in vederea remedierii problemei...

Daca cineva cunoaste problema asta la Meriva A, ideile sunt binevenite.....

Salut
Aceeasi problema o am si eu la vectra b 2001 1.6 16v eroare 1530 si clima merge doar cu motorul rece dimineata la prima cheie pentru 3 , 4 minute si se opreste si nu mai porneste.

Am verificat instalatia nu are pierderi si am completat cu freon, am schimbat senzorii, am masurat bobina de pe compresor = 4.5 , am verificat releele de langa baterie sunt ok, am verificat firele de la compresor pana la releu e ok.

O idee ceva?

La prima cheie cand porneste si clima merg si ventilatoarele si la racire motor la fel pormesc