All values measured to ground unless otherwise noted
Conn./Plug/Pin Pin Information Test Value Comments
N47-2      
1.1-6 Pins not used    
1.7 Stop lamp switch (normally closed) input 12 VDC with brakes not applied, 0 VDC with brakes applied.  
1.8 Pin not used    
1.9 Circuit 30 main power input 12 VDC at all times  
1.10 "Diagnostic port" for DTC readout and diagnostic purpose Ignition on 12 VDC To be tested with
HHT refer to D.M.
1.11 Pin not used    
1.12
1.13		 Right rear axle VSS sensor, + input
Right rear axle VSS sensor, - input		 ECM disconnected
0.6-1.8 kOhms across pins 1.14 and 1.15
Sine wave. Frequency varies with wheel speed		 Note
1.14
1.15		 Left rear axle VSS sensor, + input.
Left rear axle VSS sensor, - input.		 ECM disconnected
0.6-1.8 kOhms across pins 1.12 and 1.13
Sine wave. Frequency varies with wheel speed.		 Note
1.16 Main ground to W16/4 Approx. 0 Ohms to ground or
measure to circuit 30 12 VDC		 same as pin 1.34
1.17 MIL data output to ABS relating indicator
lamps in IC		 Ignition on 3 - 4 VDC
indicator lamps A1e17 will be lit		 valid for vehicles
without CAN to IC
1.18 Right rear axle VSS output, generated by L6/3, processed in ECM and sent to other ECMs Ignition on, lift rear of vehicle.
Turn any rear wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving		  
1.19 MIL data output to ETS relating indicator
lamps in IC		 Ignition on 3 - 4 VDC
indicator lamps A1e36 will be lit		 valid for vehicles
without CAN to IC
1.20 Pin not used    
1.21 ETS signal output to CC ECM Ignition on < 1 VDC
Engine at idle 12 VDC		  
1.22 Stop lamp switch (normally open) input.
Same signal as to brake lights		 12 VDC with brakes applied, 0 VDC with brakes not applied  
1.23,24 Pin not used    
1.25 Circuit 61 (engine running) signal input
processed in IC from circuit D+		 Ignition on < 1 VDC
engine at idle 12 VDC		 D+ signal from generator G2
1.26 LF VSS output, generated by L6/1, processed in ECM and sent to other ECMs Ignition on, lift front of vehicle.
Turn left front wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving		 20 mph / 200 Hz
35 mph / 330 Hz
square wave
1.27 Circuit 87 fused power input from BM Ignition on 12 VDC Feed from K1
1.28-32 Pins not used    
1.33 MIL data output to ASR relating indicator
lamps in IC		 Ignition on 3 - 4 VDC
indicator lamps A1e35 will be lit		 valid for vehicles
without CAN to IC
1.34 Main ground to W16/4 Approx. 0 Ohms to ground or
measure to circuit 30 12 VDC		 same as pin 1.16
2.1
2.14		 Left front axle VSS sensor, + input
Left front axle VSS sensor, - input		 ECM disconnected
0.8-2.3 kOhms across pins 2.1 and 2.14
Sine wave. Frequency varies with wheel speed		 Note
2.2
2.15		 Right front axle VSS sensor, + input
Right front axle VSS sensor, - input		 ECM disconnected
0.8-2.3 kOhms across pins 2.2 and 2.15
Sine wave. Frequency varies with wheel speed		 Note
2.3 Solenoid valve relay activation switched ground signal output 12 VDC to pin 2.17 with relay activated coil resistance approx. 40-80 Ohms
2.4,5 Pins not used    
2.6 Inlet valve signal output, switched ground activates solenoid valve A7/3y15 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.7 Left front axle hold valve signal, switched ground activates solenoid valve A7/3y6 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.8 Right front axle release valve signal, switched ground activates solenoid valve A7/3y9 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohms to ground		  
2.9 Pin not used    
2.10 Switchover valve signal output, switched ground activates solenoid valve A7/3y5
 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.11 Pin not used    
2.12 Left rear axle release valve signal, switched ground activates solenoid valve A7/3y11 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohms to ground		  
2.13 Right rear axle hold valve signal, switched ground activates solenoid valve A7/3y12 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.14     see Pin 2.1
2.15     see Pin 2.2
2.16 Pin not used    
2.17 Voltage supply output to return pump and solenoid valve relay Ignition on 12 VDC measure to pin 2.3
12 VDC with relay activated		  
2.18,19 Pins not used    
2.20 Left front axle release valve signal, switched ground activates solenoid valve A7/3y7 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohms to ground		  
2.21 Pin not used    
2.22 Right front axle hold valve signal, switched ground activates solenoid valve A7/3y8 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.23 Return pump valve activation switched ground signal output 12 VDC to pin 2.17 with relay activated coil resistance approx. 40-80 Ohms
2.24 Pin not used    
2.25 Return pump relay activated monitoring signal input and pump voltage supply 12 VDC to pin 2.17 with relay activated coil resistance approx. 40-80 Ohms
Note 2
2.26 Left rear axle hold valve signal, switched ground activates solenoid valve A7/3y10 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohms to ground		  
2.27 Right rear axle release valve signal, switched ground activates solenoid valve A7/3y13 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohms to ground		  
2.28-41 Pins not used    
Note To test, spin wheel at 1 rev/sec, measure at least 120 mVAC between both wires of sensor. If voltage is OK, measure the sensor's resistance while pulling, twisting and bending the sensor wires, looking for intermittent opens. Finally, check the sensor tip and rotor teeth for dirt or breakage. An oscilloscope can also be used to check the waveform - chipped or dirty teeth show up as missing or malformed waves.