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Test readings, BCM

Test readings, BCM

Scope



The following pages contain values and instructions for measuring signals and levels on BCM.

Remember:


• Note the test conditions and use common sense when assessing the test results.

• First check that the control module has a power supply and is grounded.

• Then check all sensor inputs and signals from other systems.

• Finally, check the control module outputs. Remember that the test reading does not indicate whether the actuator works.

• If any reading is not OK, consult the wiring diagram to trace which leads, connectors or components should be checked more thoroughly.

• The specified values refer to a calibrated Fluke 88/97.

• Test readings % (+) and ms (+) show the signal's pulse ratio and pulse length, respectively. A test instrument that can measure pulse ratio and pulse width must be used. The sign indicates the positive trigger pulse, TRIG+.


Connection K78


Note

All units connected to the 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 Occupied seat 2-6 2-6 5V 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 Closed door 9-21 9-21 4.1V 7.3V
10 Door switch RL IN Ignition ON Open door Closed door 10-21 10-21 4.1V 7.3V
11 Door switch FR IN Ignition ON Open door Closed door 11-21 11-21 4.1V 7.3V
12 Door switch FL IN Ignition ON Open door Closed door 12-21 12-21 4.1V 7.3V
13 Coolant level switch, IN Open switch Closed switch 13-21 13-21 B+ <0.1V
14 Instrument illumination, bulbs OUT Ignition ON Rheostat MAX Rheostat MIN 14-21 14-21 B+ 1.6V
15 Not connected
16 Instrument illumination, LED OUT Ignition ON Rheostat MAX Rheostat MIN 16-21 16-21 B+ 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 Closed boot lid 32-21 32-21 4.1V 7.3V
33 Not connected
34 Brake fluid level switch IN Ignition ON Open switch Closed switch 34-21 34-21 B+ <0.1
35 AC OUT Ignition ON Button not actuated Button depressed 35-21 35-21 B+ <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 Sensor disconnected 47-21 47-21 2.2V 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 Handbrake not applied 55-21 55-21 <0.1 B+
56 Not connected
57 Electrically heated rear window OUT Ignition ON 57-21 B+
58 Boot lid lock microswitch IN Ignition ON ON Unactuated handle Depressed handle 58-21 58-21 10V <0.5V
59 Not connected
60 Bonnet switch IN Ignition ON Open bonnet Closed bonnet 60-21 60-21 <0.5V 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.

Connection K16

Note

All units connected to the I and P-buses send out signals.


Control module pin Component/ function IN/OUT Test conditions Across Test reading
1-4 Not connected OUT
5 +30 IN Ignition ON 5-B+ <0.5
6 +54 OUT Ignition ON 6-B+ <0.5
7 Not connected
8 Interior lighting relay OUT 8-B+ <0.5
9-12 Not connected
13 Accessories relay OUT Ignition ON 13-B+ <0.5
14 Not connected
15 Interior lighting IN 15-B+ <0.5
16 +30 IN 16-B+ <0.5