Hi guys, heres my problem:

DTC: 74
Driving the car with the parking brake ON. ON 5 minutes
after detection

I can drive for 5mins with the 4ws light off and as soon as it detects the 74 error the light comes on. I am not driving with the parking brake on.

I have pulled the 4ws computer plugs and found the green/red wire which goes to the park brake switch and tested it with a multimeter. It is functioning properly.

The park brake wire is grounded when the park brake lever is in UP position, and the circuit is broken when the brake lever is DOWN.

I then pulled out the pin on the plug for green/red effectively making the 4ws computer think that the park brake is never on. (why does the 4ws system care if you're driving with the park brake on anyway?)

I then took it for a test drive, and same result, after 5mins of driving I got error 74.

I am assuming something is wrong inside the 4ws computer?
I did the "4ws solder dry joints" fix about 2 years ago and have had no troubles with 4ws until now.

Any thoughts?

This is the 4ws plug and what you need to do to pull it apart.

 

No one's had this problem?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AdReNaLiN &raquo;</TD></TR><TR><TD CLASS="quote">The park brake wire is grounded when the park brake lever is in UP position, and the circuit is broken when the brake lever is DOWN.</TD></TR></TABLE>

According to the service manual that wire should have battery voltage when the parking brake is off and 0v when on.