Can the wife/husband of an expatriate work?

Nope. Dependant pass not allowed to work
You need to apply for an Employment Pass

Obtained the below information from www.imi.gov.myhttp://www.imi.gov.my/index.php/en/cont … stion.html
FAQs About the Employment Pass
Can the wife of an expatriate work?
Yes. The husband / wife of an expatriate holding the Dependant Pass is allowed to work without having to change the Dependant Pass to the Employment Pass as long as he/she has received the endorsement for work from the Immigration Department of Malaysia.

Correct Shehajaz - the rule changed in the last year or two and all foreigners who wish to work must get a full work permit.  (Exception is those on LTSVP married to Malaysians where an endorsement system is still used).

The website referred to has not been updated and is NOT correct.