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Connection K78

Fig 1: Identifying Connection K78 Connector Pinouts
G05571385Courtesy of SAAB-SCANIA OF AMERICA, INC.
NOTE: All units connected to the I and P-buses send out signals.
I AND P-BUSES SEND OUT SIGNALS

Control module pin Component/function IN/OUT Test conditions Across Test reading
1 Ultrasound sensor, signal IN Ignition ON   1-6 B+
2 Seat sensor, signal IN Ignition ON Unoccupied seat 2-6 5V
Occupied seat 2-6 Approx. 1V
3 Electrically heated rear window, indicator OUT Ignition ON Electrically heated rear window ON 3-6 B+
4 Seat sensor, ground IN Ignition ON   4-B+ B+
5 LED, alarm OUT Ignition ON Activate with T2 5-6 8V for 5 secs.
6 Power ground IN Ignition ON   6-B- <0.1V
7 Rear fog light OUT Ignition ON   7-6 B+
8 Not connected IN        
9 Door switch RR IN Ignition ON Open door 9-21 4.1V
Closed door 9-21 7.3V
10 Door switch RL IN Ignition ON Open door 10-21 4.1V
Closed door 10-21 7.3V
11 Door switch FR IN Ignition ON Open door 11-21 4.1V
Closed door 11-21 7.3V
12 Door switch FL IN Ignition ON Open door 12-21 4.1V
Closed door 12-21 7.3V
13 Coolant level switch, IN   Open switch 13-21 B+
Closed switch 13-21 <0.1V
14 Instrument illumination, bulbs OUT Ignition ON Rheostat MAX 14-21 B+
Rheostat MIN 14-21 1.6V
15 Not connected          
16 Instrument illumination, LED OUT Ignition ON Rheostat MAX 16-21 B+
Rheostat MIN 16-21 3.3V
17 Indicator, hazard warning lights OUT Ignition ON Hazard warning lights ON 17-21 B+/0V
18 Interior lighting PWM OUT Ignition ON   18-21 <0.5
19 Interior lighting OUT Ignition ON   19-21 B+
20 Solenoid, fuel filler flap IN/OUT Ignition ON Hazard warning lights ON 20-21 B+ for 0.5 s
21 Power ground IN Ignition ON   21-B- <0.1V
22-27 Not connected          
28 Front fog lights OUT Ignition ON   28-21 6V
29 Headlamps pos 1 OUT Ignition ON   29-21 6V
30 Headlamps pos 2 OUT Ignition ON   30-21 5.5V
31 Not connected          
32 Luggage compartment switch IN Ignition ON Open boot lid 32-21 4.1V
Closed boot lid 32-21 7.3V
33 Not connected          
34 Brake fluid level switch IN Ignition ON Open switch 34-21 B+
Closed switch 34-21 <0.1
35 AC OUT Ignition ON Button not actuated 35-21 B+
Button depressed 35-21 <0.5
36-39 Not connected          
40 I-bus IN/OUT Ignition ON Connect 86 11 857 Test lamp, red/green 40-21 The test lamp should flash
41 I-bus IN/OUT Connect 86 11 857 Test lamp, red/green ON 4-21 The test lamp should flash
42-43 Not connected          
44 Outside temperature sensor IN Ignition ON   44-B+ B+
45 Siren OUT Ignition ON   45-21 B+
46 Not connected          
47 Outside temperature sensor   Ignition ON 20 degrees 47-21 2.2V
Sensor disconnected 47-21 5V
48-50 Not connected          
51 Parking heater OUT Ignition ON Relay activated 51-21 <0.5V
52 Not connected          
53 Block heater OUT Ignition ON Output active (heater on) 53-21 approx. B+
54 Not connected          
55 Handbrake switch IN Ignition ON Handbrake applied 55-21 <0.1
Handbrake not applied 55-21 B+
56 Not connected          
57 Electrically heated rear window OUT Ignition ON   57-21 B+
58 Boot lid lock microswitch IN Ignition ON ON 58-21 10V
Unactuated handle 58-21 <0.5V
Depressed handle    
59 Not connected          
60 Bonnet switch IN Ignition ON Open bonnet 60-21 <0.5V
Closed bonnet 60-21 10V
61 Hazard warning lights OUT Ignition ON   61-21 B+
62 Ultrasound sensor, ground IN   Always 62-B+ B+
63-77 Not connected          
78 Solenoid, fuel filler flap IN/OUT Ignition ON   78-21 B+ for 0.5 s

(*) All connected control modules send out voltage.

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