| 1 |
Visual inspection |
- Switch off ignition
- Remove connector for temperature mixing valve
|
Check the connector for corrosion and that it is correctly inserted
Step 2 |
Clean connector or plug in correctly
-> End |
| 2 |
Check 5 V - supply line to temperature mixing valve motor |
- Switch on ignition
- Measure voltage at plug of the temperature mixing valve between pin 3 and ground
- Measure voltage at plug of the temperature mixing valve between pin 3 and pin 1
|
approx. 5 V
Step 3 |
Step 6 |
| 3 |
Check signal line and servo motor line for short to B+ |
- Switch off ignition
- Remove plug B from the air-conditioning system regulator
- Measure voltage at plug B of the air-conditioning system regulator between pin 13 and ground
- Measure voltage at plug D of the air-conditioning system regulator between pin 10 and ground
- Measure voltage at plug D of the air-conditioning system regulator between pin 2 and ground
|
0 V
Step 4 |
Repair wiring hamess
-> End |
| 4 |
Check signal line and servo motor line for short to gound |
- Measure resistance at plug B of the air-conditioning system regulator between pin 13 and ground
- Measure resistance at plug D of the air-conditioning system regulator between pin 10 and ground
- Measure resistance at plug D of the air-conditioning system regulator between pin 2 and ground
|
Step 5 |
Repair wiring hamess
-> End |
| 5 |
Check signal line and servo motor line for interruption |
- Switch off ignition
- Remove plug B from the air-conditioning system regulator
- Measure resistance between plug B on the air-conditioning system regulator pin 13 and plug on temperature mixing valve pin 2
- Measure resistance at plug D of the air-conditioning system regulator between pin 10 and ground
- Measure resistance at plug D of the air-conditioning system regulator between pin 2 and ground
|
< 5
Step 10 |
Repair wiring hamess
-> End |
| 6 |
Check 5 V supply lead for short to B+ |
- Remove plug B from the air-conditioning system regulator
- Switch on ignition
- Measure voltage at plug B of the air-conditioning system regulator between pin 20 and ground
|
0 V
Step 7 |
Repair wiring hamess
-> End |
| 7 |
Check 5 V supply line for short to ground |
- Measure resistance at plug B of the air-conditioning system regulator between pin 20 and ground
|
Step 8 |
Repair wiring harness
-> End |
| 8 |
Check 5 V supply line and ground line for open circuit |
- Measure resistance between plug B on the air-conditioning system regulator pin 20 and plug on temperature mixing valve pin 3
- Measure resistance between plug B on the air-conditioning system regulator pin 9 and plug on temperature mixing valve pin 1
|
< 5
Step 9 |
Repair wiring hamess
-> End |
| 9 |
Check ground line for open circuit |
- Measure resistance between plug B on the air-conditioning system regulator pin 9 and plug on temperature mixing valve pin 1
|
< 5
Step 11 |
Repair wiring harness
-> End |
| 10 |
- Repace servo motor for temperature mixing valve
|
-> End |
| 11 |
- Replace air-conditioning system regulator
|
->End |