When I was doing that AAN intake manifold area two-pin post the other day, I lacked full info on the after-run pump connector with its three wires (two siamesed into one pin). This lead to a search for the wiring diagram. Not easy. Yodasfro (Austin) found it for me (thanks Austin) in the Bentley. I decided to document the wiring and the logic behind the way the after-run pump works. This will be added to my previous after-run pump post at some point. For now, I am trying it out on you lot. 
In general, the after-run pump and stage 1 of the rad fan only come on if the temperatures *AFTER* engine shut down exceed 110 C. If this happens the F98 Thermal Switch triggers the J155 After-run pump and fan control module to fire up the pump and stage 1 of the rad fan until the temp drops to 90 C or 10 minutes have gone by, whichever comes first.
But that is skipping ahead. Backing up, the power for the after-run pump comes from the No.30 constant power bus in a red wire to the S61 fuse (a branch of that red wire also goes to the S26/102 ECU fuse that feeds pin T55/18 on the ECU (this is for the AAN, ABY/ADU different numbers but the same idea). After the S61, the wire is white/black and heads to the two pin After-run pump connector.
At the after-run pump connector, a second white/black wire branches off to the F98 thermal switch. When this switch closes at 110 C or above, the current flows to the J155 ("324") after-run pump and fan control module in a red/green wire going to pin 2/30 on the module. The module itself is energized by switch power from the J17 fuel pump relay via the S73 thermal fuse that also feeds the O2 sensor heater. From the S73, a yellow wire feeds the J155 (324) module at Pin 4/87F.
With the signal from the closed F98 thermal switch, the J155 (324) control module opens up a ground for the after-run pump at the module's Pin 8/87. Power flows through the V51 after-run pump in the white/black wire and out via the brown/black wire connected to the control module's Pin 8/87 (which then flows out to ground (earth) at the module's Pin 6/31).
In the meantime, the J69 (214) Stage 1 rad fan relay has been sitting with power (but no ground (earth)) from the S19 (AAN number) fuse via a red/white wire to J69 pin 2/30 and a red wire to J69 pin 5/85. When the J155 (324) gets the closed signal from the F98 thermal switch, a ground for the J69 (214) relay is opened at J69 pin 4/86. This pulls the relay on and power then flows through the S19 fuse, through the J69 (214) and out to the V7 rad fan (Stage 1) as a red/white wire from J69 Pin 8/87.
This continues on until the temp drops to 90 C and the F98 thermal switch opens again or the internal timer in the J155 (324) control module times out at 10 minutes. Presumably if the temp was not less than 110 C then, the process would repeat itself.
Hope that was clear.
(it might need some edits, if not).
In general, the after-run pump and stage 1 of the rad fan only come on if the temperatures *AFTER* engine shut down exceed 110 C. If this happens the F98 Thermal Switch triggers the J155 After-run pump and fan control module to fire up the pump and stage 1 of the rad fan until the temp drops to 90 C or 10 minutes have gone by, whichever comes first.
But that is skipping ahead. Backing up, the power for the after-run pump comes from the No.30 constant power bus in a red wire to the S61 fuse (a branch of that red wire also goes to the S26/102 ECU fuse that feeds pin T55/18 on the ECU (this is for the AAN, ABY/ADU different numbers but the same idea). After the S61, the wire is white/black and heads to the two pin After-run pump connector.
At the after-run pump connector, a second white/black wire branches off to the F98 thermal switch. When this switch closes at 110 C or above, the current flows to the J155 ("324") after-run pump and fan control module in a red/green wire going to pin 2/30 on the module. The module itself is energized by switch power from the J17 fuel pump relay via the S73 thermal fuse that also feeds the O2 sensor heater. From the S73, a yellow wire feeds the J155 (324) module at Pin 4/87F.
With the signal from the closed F98 thermal switch, the J155 (324) control module opens up a ground for the after-run pump at the module's Pin 8/87. Power flows through the V51 after-run pump in the white/black wire and out via the brown/black wire connected to the control module's Pin 8/87 (which then flows out to ground (earth) at the module's Pin 6/31).
In the meantime, the J69 (214) Stage 1 rad fan relay has been sitting with power (but no ground (earth)) from the S19 (AAN number) fuse via a red/white wire to J69 pin 2/30 and a red wire to J69 pin 5/85. When the J155 (324) gets the closed signal from the F98 thermal switch, a ground for the J69 (214) relay is opened at J69 pin 4/86. This pulls the relay on and power then flows through the S19 fuse, through the J69 (214) and out to the V7 rad fan (Stage 1) as a red/white wire from J69 Pin 8/87.
This continues on until the temp drops to 90 C and the F98 thermal switch opens again or the internal timer in the J155 (324) control module times out at 10 minutes. Presumably if the temp was not less than 110 C then, the process would repeat itself.
Hope that was clear.
(it might need some edits, if not).