ABS wiring help needed
01-07-2021, 03:29 AM
#1
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ABS wiring help needed
As I rewire my whole car, I get to integrating the '86 928S ABS system and there are a lot of wires.
Most are essential but some I think are surplus to my new system???
Attached I have a schematic of how I think I can tie it in with my new stuff.
The Link Thunder ECU wants (will use) input from the wheel speed sensors through dedicated connections that will not be seen by the Bosch ABS unit.
This bit is pretty straight forward, just some splicing and soldering.
Porsche have a 4 pin plug that connects the ABS system into the cabin. Pin #1, goes to the alternator terminal #61? then on to the Alarm module. What does this do?
Pin #2 goes to the stop light switch, Tempostat unit and to the Lamp check unit. What does this do?
Pins 3 and 4 are power from the relay.
Another wire from the ABS unit pin #15, goes to the central warning unit. Is this the ABS warning light?
I'm hoping one of the many much smarter than me can help here.
Most are essential but some I think are surplus to my new system???
Attached I have a schematic of how I think I can tie it in with my new stuff.
The Link Thunder ECU wants (will use) input from the wheel speed sensors through dedicated connections that will not be seen by the Bosch ABS unit.
This bit is pretty straight forward, just some splicing and soldering.
Porsche have a 4 pin plug that connects the ABS system into the cabin. Pin #1, goes to the alternator terminal #61? then on to the Alarm module. What does this do?
Pin #2 goes to the stop light switch, Tempostat unit and to the Lamp check unit. What does this do?
Pins 3 and 4 are power from the relay.
Another wire from the ABS unit pin #15, goes to the central warning unit. Is this the ABS warning light?
I'm hoping one of the many much smarter than me can help here.
01-08-2021, 02:27 AM
#2
Former Vendor
As I rewire my whole car, I get to integrating the '86 928S ABS system and there are a lot of wires.
Most are essential but some I think are surplus to my new system???
Attached I have a schematic of how I think I can tie it in with my new stuff.
The Link Thunder ECU wants (will use) input from the wheel speed sensors through dedicated connections that will not be seen by the Bosch ABS unit.
This bit is pretty straight forward, just some splicing and soldering.
Porsche have a 4 pin plug that connects the ABS system into the cabin. Pin #1, goes to the alternator terminal #61? then on to the Alarm module. What does this do?
Pin #2 goes to the stop light switch, Tempostat unit and to the Lamp check unit. What does this do?
Pins 3 and 4 are power from the relay.
Another wire from the ABS unit pin #15, goes to the central warning unit. Is this the ABS warning light?
I'm hoping one of the many much smarter than me can help here.
Most are essential but some I think are surplus to my new system???
Attached I have a schematic of how I think I can tie it in with my new stuff.
The Link Thunder ECU wants (will use) input from the wheel speed sensors through dedicated connections that will not be seen by the Bosch ABS unit.
This bit is pretty straight forward, just some splicing and soldering.
Porsche have a 4 pin plug that connects the ABS system into the cabin. Pin #1, goes to the alternator terminal #61? then on to the Alarm module. What does this do?
Pin #2 goes to the stop light switch, Tempostat unit and to the Lamp check unit. What does this do?
Pins 3 and 4 are power from the relay.
Another wire from the ABS unit pin #15, goes to the central warning unit. Is this the ABS warning light?
I'm hoping one of the many much smarter than me can help here.
Porsche loves to use #61 alternator connection to tell computers that the engine is actually running. It's a great way to know this...the alternator can't spin without the engine turning and it won't shut off the idiot light (which #61 does) until the engine is turning faster than cranking speed..
Any connection to the brake light switch has to be telling only one thing....the brakes have been applied....And no matter how gently they are applied, the brake light switch detects it first.
Last edited by GregBBRD; 01-08-2021 at 02:30 AM.