No. 4 Brake System Warning Light Does Not Illuminate (With TCS): Notes

WARNING: This page is about a different car, the 2004 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

When performing an asterisked (*) troubleshooting inspection. Shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

Fig 1: Possible Cause - NO. 4 Brake System Warning Light Does Not Illuminate (With TCS)

Courtesy of MAZDA MOTORS CORP.