I have given myself the project of reverse engineering a TRW EBC 430 ABS unit, typically used in early 2000’s Vauxhall or GM cars.

I believe they were designed by Kelsey-Hayes and produced by TRW given the numerous ABS related patents granted to Kelsey.

1. Primary microcontroller – AN87C196LA which is a 16-bit Intel 80C196 variant.
2. Secondary microcontroller – T83C51RB2 which is an 8-bit Intel 80C51 variant made by Atmel.
3. Atmel U6809B – Failsafe IC with relay and lamp driving circuitry.
4. ST 37041 90T316 – Judging by the surrounding components I think this is a VR sensor conditioning chip for the 4 ABS wheel speed sensors.
5. Temic 9344.1M – Purpose unknown so far. Temic was a German semicon manufacturer who developed various automotive control modules.
6. ST M24C01 – Serial I2C EEPROM connected to the primary MCU.
7. Infineon 2N06L64 & 2N06L23 – N-Channel MOSFETs for driving the ABS valve solenoids.
8. Fairchild HUF75344 – N-Channel power MOSFET for driving the ABS pump motor.
9. Collection of diodes, resistors & capacitors – These are for filtering the VR sensor signals before processing by #4.
10. ST L4949ED – Low drop voltage regulator for 5V output.

I’m working on a KiCad schematic for the above PCB but it’s slow going as this is a multi layer board with a solid copper ground plane on the back so it’s difficult to follow where some signals go after vias.