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Test Readings, Control Module Connections: K12

Fig 1: Identifying Connector Terminal
G03518383Courtesy of SAAB-SCANIA OF AMERICA, INC.
PIN AND TEST CONDITION REFERENCE

Pin Pin BOB Cable Colour Component/Function In/Out Test conditions Test Between Test reading See
1 (K12) 21 RD/BU Battery voltage (+15 circuit) In Ignition ON 21-B+ < 0.5 V TEST READINGS, CONTROL MODULE CONNECTIONS 
2 (K12) 22 BK Ground In Ignition ON 22-B- < 0.5 V GROUND 
3 (K12) 23 BK Ground In Ignition ON 23-B- < 0.1 V GROUND 
4 (K12) 24 GN P-bus (+) In/Out Ignition ON 24-22 2.5 V BUS COMMUNICATION 
5 (K12) 25 GN I-bus (+) In/Out Ignition ON 25-22 2.5 V BUS COMMUNICATION 
6 (K12) 26 RD/BU Battery voltage (+15 Circuit) In Ignition ON 26-B+ < 0.5 V POWER SUPPLY 
7 (K12) 27 RD Battery voltage (+30 circuit) In Ignition ON 27-B+ < 0.5 V POWER SUPPLY 
8 (K12) 28 GY/WH Ground, Sensor ground, fuel level sensor Out Ignition ON 28-B- < 0.1 V FUEL GAUGE 
9 (K12) 29 YE/WH Sensor, fuel level In Ignition ON 29-28 0.5-3.7 V FUEL GAUGE 
10 (K12) 30 VT Wheel speed, Rear left In Rotate wheel slowly 30-32 0 V B+
(LP HI  LOp)
SPEEDOMETER 
          Rotate wheel 1/2 revolution per second 30-22 15 Hz 50%
(LP HI  LOp)
 
11 (K12) 31 WH P-bus (-)   Ignition ON 31-22 2.5 V BUS COMMUNICATION 
12 (K12) 32 WH I-bus (-)   Ignition ON 32-22 2.5 V BUS COMMUNICATION 

= greater than; < = less than; ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulse)