* SPICE netlist
V1 -15V 0 -15
V2 15V 0 15V
V3 5V 0 5
V4 V_SQ_5V 0 PULSE(0 5 1u 1u 1u 0.5m 1m)
R1 5V N007 100k
R2 N007 0 100k
XU2 N007 2V5 5V 0 2V5 LF353 ;pnba In+)In-)V+)V-)OUT
XU1 N008 N005 15V -15V N006 LF353 ;pnba In+)In-)V+)V-)OUT
R3 N005 2V5 220k
R4 N008 V_SQ_5V 220k
R5 N006 N005 330k
R6 N008 0 330k
R7 V_SENS N006 1k
R8 N008 V_SQ_5V 100k
R9 N005 2V5 100k
R12 15V N002 50k
R13 N002 0 100k
XU4 N002 10V 15V 0 10V LF353 ;pnba In+)In-)V+)V-)OUT
XU5 V_SENS 10V 5V 0 V_VEHICLE_DETECT LM324 ;pnba In+)In-)V+)V-)OUT
XU6 V_SENS 7V 5V 0 V_VEHICLE_READY LM324 ;pnba In+)In-)V+)V-)OUT
R14 N001 0 2k74
R15 N001 N004 1k3
R16 15V N003 800k
R17 N003 0 700k
XU8 N003 7V 15V 0 7V LF353 ;pnba In+)In-)V+)V-)OUT
D1 V_SENS N001 D
.tran 5m

* LTspice schematic (.asc)
Version 4
SHEET 1 1248 848
WIRE 320 -424 240 -424
WIRE 480 -424 384 -424
WIRE 576 -424 480 -424
WIRE -608 -408 -608 -424
WIRE -384 -408 -528 -408
WIRE -240 -408 -240 -424
WIRE -16 -408 -160 -408
WIRE 480 -360 480 -424
WIRE 576 -360 576 -424
WIRE -528 -344 -528 -408
WIRE -496 -344 -528 -344
WIRE -160 -344 -160 -408
WIRE -128 -344 -160 -344
WIRE -384 -328 -384 -408
WIRE -384 -328 -432 -328
WIRE -352 -328 -384 -328
WIRE -16 -328 -16 -408
WIRE -16 -328 -64 -328
WIRE 16 -328 -16 -328
WIRE -608 -312 -608 -328
WIRE -496 -312 -608 -312
WIRE -240 -312 -240 -328
WIRE -128 -312 -240 -312
WIRE -608 -296 -608 -312
WIRE -240 -296 -240 -312
WIRE 480 -248 480 -280
WIRE 576 -248 576 -280
WIRE -608 -200 -608 -216
WIRE -240 -200 -240 -216
WIRE -608 -104 -608 -120
WIRE -384 -104 -528 -104
WIRE -32 -56 -48 -56
WIRE 64 -56 48 -56
WIRE 112 -56 96 -56
WIRE 208 -56 192 -56
WIRE -528 -40 -528 -104
WIRE -496 -40 -528 -40
WIRE -384 -24 -384 -104
WIRE -384 -24 -432 -24
WIRE -352 -24 -384 -24
WIRE -608 -8 -608 -24
WIRE -496 -8 -608 -8
WIRE -608 8 -608 -8
WIRE -48 24 -48 -56
WIRE -48 24 -96 24
WIRE -32 24 -48 24
WIRE 64 24 64 -56
WIRE 64 24 48 24
WIRE 64 56 64 24
WIRE 96 56 96 -56
WIRE 96 56 64 56
WIRE 112 56 96 56
WIRE 208 72 208 -56
WIRE 208 72 176 72
WIRE 240 72 208 72
WIRE 352 72 320 72
WIRE 96 88 64 88
WIRE 112 88 96 88
WIRE -608 104 -608 88
WIRE -48 120 -96 120
WIRE -32 120 -48 120
WIRE 64 120 64 88
WIRE 64 120 48 120
WIRE 96 152 96 88
WIRE -48 200 -48 120
WIRE -32 200 -48 200
WIRE 64 200 64 120
WIRE 64 200 48 200
WIRE 528 232 496 232
WIRE 624 248 592 248
WIRE 96 264 96 232
WIRE 528 264 496 264
WIRE -608 312 -608 280
WIRE -496 312 -496 280
WIRE -384 312 -384 280
WIRE -288 312 -288 280
WIRE 528 376 496 376
WIRE 624 392 592 392
WIRE 528 408 496 408
WIRE -608 424 -608 392
WIRE -496 424 -496 392
WIRE -384 424 -384 392
WIRE -288 424 -288 392
FLAG -608 280 -15V
FLAG -496 280 15V
FLAG -384 280 5V
FLAG -288 280 V_SQ_5V
FLAG -608 424 0
FLAG -496 424 0
FLAG -384 424 0
FLAG -288 424 0
FLAG -464 8 0
FLAG -464 -56 5V
FLAG -608 104 0
FLAG -608 -120 5V
FLAG -352 -24 2V5
FLAG 144 104 -15V
FLAG 144 40 15V
FLAG -96 120 V_SQ_5V
FLAG -96 24 2V5
FLAG 96 264 0
FLAG 352 72 V_SENS
FLAG -464 -296 0
FLAG -464 -360 15V
FLAG -608 -200 0
FLAG -608 -424 15V
FLAG -352 -328 10V
FLAG 496 232 10V
FLAG 496 264 V_SENS
FLAG 496 408 V_SENS
FLAG 560 216 5V
FLAG 560 360 5V
FLAG 560 280 0
FLAG 560 424 0
FLAG 624 248 V_VEHICLE_DETECT
FLAG 496 376 7V
FLAG 624 392 V_VEHICLE_READY
FLAG 480 -248 0
FLAG 576 -232 0
FLAG 240 -424 V_SENS
FLAG -96 -296 0
FLAG -96 -360 15V
FLAG -240 -200 0
FLAG -240 -424 15V
FLAG 16 -328 7V
SYMBOL voltage -608 296 R0
SYMATTR InstName V1
SYMATTR Value -15
SYMBOL voltage -496 296 R0
SYMATTR InstName V2
SYMATTR Value 15V
SYMBOL voltage -384 296 R0
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL voltage -288 296 R0
SYMATTR Value PULSE(0 5 1u 1u 1u 0.5m 1m)
SYMATTR InstName V4
SYMBOL res -624 -120 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res -624 -8 R0
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL Opamps\\opamp2 -464 -88 R0
SYMATTR InstName U2
SYMATTR Value LF353
SYMBOL Opamps\\opamp2 144 8 R0
SYMATTR InstName U1
SYMATTR Value LF353
SYMBOL res 64 8 R90
SYMATTR InstName R3
SYMATTR Value 220k
SYMBOL res 64 104 R90
SYMATTR InstName R4
SYMATTR Value 220k
SYMBOL res 208 -72 R90
SYMATTR InstName R5
SYMATTR Value 330k
SYMBOL res 80 136 R0
SYMATTR InstName R6
SYMATTR Value 330k
SYMBOL res 336 56 R90
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL res 64 184 R90
SYMATTR InstName R8
SYMATTR Value 100k
SYMBOL res 64 -72 R90
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL res -624 -424 R0
SYMATTR InstName R12
SYMATTR Value 50k
SYMBOL res -624 -312 R0
SYMATTR InstName R13
SYMATTR Value 100k
SYMBOL Opamps\\opamp2 -464 -392 R0
SYMATTR InstName U4
SYMATTR Value LF353
SYMBOL Opamps\\opamp2 560 184 R0
SYMATTR InstName U5
SYMATTR Value LM324
SYMBOL Opamps\\opamp2 560 328 R0
SYMATTR InstName U6
SYMATTR Value LM324
SYMBOL res 464 -376 R0
SYMATTR InstName R14
SYMATTR Value 2k74
SYMBOL res 560 -376 R0
SYMATTR InstName R15
SYMATTR Value 1k3
SYMBOL res -256 -424 R0
SYMATTR InstName R16
SYMATTR Value 800k
SYMBOL res -256 -312 R0
SYMATTR InstName R17
SYMATTR Value 700k
SYMBOL Opamps\\opamp2 -96 -392 R0
SYMATTR InstName U8
SYMATTR Value LF353
SYMBOL diode 320 -408 R270
SYMATTR InstName D1