95 Sc400 - Replace Ecm?

[taunta henny]

My Air quit working at the end of last summer. It's not the fuse as in other discussions as the lighter still works, so I had some diagnotics run and the results are:

Refrigerant level appears fully charged

Check why compressor not cutting in. Trace back to compressor clutch magnetic relay. Power going to the relay but no ground request from ECM module to relay to allow compressor clutch to magnitize. Diagnotics require replacing the ECM and retesting system.

Before I take this to Lexus what can I expect to pay to replace the ECM? I find parts in Canada re quite inflated and have ordered from the US, any suggestions where to order a new ECM?

Thanks for any help or suggestions B)

[xaine]

My Air quit working at the end of last summer. It's not the fuse as in other discussions as the lighter still works, so I had some diagnotics run and the results are:

Refrigerant level appears fully charged

Check why compressor not cutting in. Trace back to compressor clutch magnetic relay. Power going to the relay but no ground request from ECM module to relay to allow compressor clutch to magnitize. Diagnotics require replacing the ECM and retesting system.

Before I take this to Lexus what can I expect to pay to replace the ECM? I find parts in Canada re quite inflated and have ordered from the US, any suggestions where to order a new ECM?

Thanks for any help or suggestions B)

pull the codes from the a/c ecu.

press and hold the auto and recirculate air switches. turn ignition on. all indicators will flash 4 times. tone will sound when indicators flash. press and release the off switch. read codes at temp display.if tone is heard when code is displayed it is a current problem. if no tone then it is a past problem or mechanical problem.

if you cant even get the ecu to self diagnostic, perhaps it is bad or not powering up.

[taunta henny]

My Air quit working at the end of last summer. It's not the fuse as in other discussions as the lighter still works, so I had some diagnotics run and the results are:

Refrigerant level appears fully charged

Check why compressor not cutting in. Trace back to compressor clutch magnetic relay. Power going to the relay but no ground request from ECM module to relay to allow compressor clutch to magnitize. Diagnotics require replacing the ECM and retesting system.

Before I take this to Lexus what can I expect to pay to replace the ECM? I find parts in Canada re quite inflated and have ordered from the US, any suggestions where to order a new ECM?

Thanks for any help or suggestions B)

pull the codes from the a/c ecu.

press and hold the auto and recirculate air switches. turn ignition on. all indicators will flash 4 times. tone will sound when indicators flash. press and release the off switch. read codes at temp display.if tone is heard when code is displayed it is a current problem. if no tone then it is a past problem or mechanical problem.

if you cant even get the ecu to self diagnostic, perhaps it is bad or not powering up.

THanks Xaine.

I tried the process and can get the indicators to flash, but once I hit the Off switch, it terminates the process. If I do not hit the Off switch only the Fresh Air indicator flashes ( no tone) and stays there.