| Conn./Plug/Pin | Pin Information | Test Value | Comments |
| 1A.1 | Left turn signal indicator input | 12 VDC intermittent, with left turn signal on | A1e1 flashes |
| 1A.2 | Circuit 56a high beam signal indicator input. | 12 VDC with high beam headlamps on | A1e3 illuminated |
| 1A.3 | Main ground to W1 | Approx. 0 Ohms to ground | |
| 1A.4 | Circuit 61e output, "Engine Running" recognition. Processed in ECM, feed from generator via 1B.1 | 12 VDC with engine running
0 VDC with engine not running | Short protected, current decoupled from circuit 61 |
| 1A.5 | Circuit 58d output, "Dimmed Instrument Illumination" voltage | Varies from 0.5-12 VDC, depending on setting of dimming value and ambient brightness | Short protected, current decoupled from circuit 58k |
| 1A.6 | Circuit 15c "Ignition Key" recognition | 12 VDC with ignition key inserted in steering lock | Buzzing signal when door is opened with key still inserted |
| 1A.7 | Switched ground signal in case of exterior lamp failure | 0 VDC when exterior lamp failure occurs.
Approx. 12 VDC under normal condition | Exterior light bulbs
See PE82.10 (Exterior lighting) |
| 1A.8 | Serial port II, data input from A/C pushbutton module | Ignition on 6-8 VDC | |
| 1A.9 | Circuit 15g fused power input | 12 VDC with ignition on | Feed from F1f3 |
| 1A.10 | Right turn signal indicator input | 12 VDC intermittent, with right turn signal on | A1e2 flashes |
| 1A.11 | Circuit 30 power input | 12 VDC at all times. Powers clock, lights warning etc. | Feed from F1f10 |
| 1A.12 | Electronics ground to W1 | Approx. 0 Ohms to ground | |
| 1A.13 | Circuit 58k input to "Electronic Dimming Control" | 12 VDC with exterior lights on | Generated in N7 |
| 1A.14-18 | Pins not used | | |
| 1B.1 | Circuit D+ power input | Ignition on
12 VDC when engine is running
0 VDC when engine is not running | |
| 1B.2 | Brake fluid level indicator input,
ground signal in low level mode | Ignition off:
> 20k Ohms with fluid level OK
< 5 Ohms with low fluid level | |
| 1B.3 | TN signal input | Engine at idle:
5.0-7.5 VDC (engine 104, 119)
> 0.8 VAC (engine 606) | Feed from engine ECM |
| 1B.4 | ECL and windshield washer fluid level indicator input, switched to ground in low level mode | Ignition off, measured across switches:
At S41: approx. 110 Ohms = fluid level OK
< 5 Ohms = fluid level low
at S42: approx. 160 Ohms = fluid level OK
< 5 Ohms = fluid level low | Resist. substitution test, refer to D. M. |
1B.5
1B.6 | ECT sensor input
high side
low side | Ignition on, ECT: 20 °C approx. 3.7 VDC
60 °C approx. 2.1 VDC
90 °C approx. 1.2 VDC | |
| 1B.7 | Brake fluid level indicator input,
ground signal in low level mode | Ignition off:
> 20k Ohms with fluid level OK
< 5 Ohms with low fluid level | |
| 1B.8-10 | Pins not used | | |
| 1B.11 | "Diagnostic port" for DTC readout and diagnostic purpose | No reliable test. Check continuity of wiring | To be tested with HHT, refer to D. M. |
| 1B.12 | ECL and windshield washer fluid level, sensors low side | Approx. 0 Ohms to gound,
approx. 12 VDC to circuit 30 | See pin 1B.4 |
2A.1
2A.2 | Outside temperature indicator input
high side
low side | Varies up to approx. 8 VDC depending on actual outside-temperature | B14, decreasing
resistance with
increasing temperature |
| 2E-2G | Connectors and pins not used | | |
| 2I | Left front seat belt buckle switch ground signal input, lights A1e9 and sounds audible warning after ingnition on for approx. 6 sec. or until seat belt is buckled | Ignition off approx. 0 Ohms when seat belt is not buckled | |
| 2I.1 | Circuit 15R input, SRS malfunction indicator | 12 VDC ignition on | See pin 2I.2 |
| 2I.2 | SRS malfunction indicator, switched ground input. SRS module grounds pin to indicate malfunction | 0 VDC when SRS failure occurs
Approx. 12 VDC (via A1e15 from circ. 15R) under normal condition | Feed from SRS ECM |
| 2K | ADS malfunction indicator input, switched ground. ADS control module (N51) grounds this pin to indicate a malfunction. | 0 VDC when ADS failure occurs.
Approx. 12 VDC (via e27 from circ. 15g) under normal condition. | Feed from S59 |
| 2L.1 | Pin not used | | |
| 2L.2 | Door switch signal input (driver side), switched ground. Buzzer signal "Lights On Warning" feature | Ignition off approx. 0 Ohms when door is opened | |
| 2L.3 | Pin not used | | |
2L.4
2L.5 | Fuel level signal input
high side
low side | Varies up to approx. 8 VDC depending on actual fuel level (0V = max. / 8V = min.) | At approx. 6V or more lamp A1e4 will come on |
| 2L.6 | Pin not used | | |
| 2M.1 | ABS MIL signal input | Ignition on < 2 VDC, indicator lamp on
engine at idle 12 VDC, indicator lamp off | Feed from ETS/ARS ECM |
| 2M.2 | LF VSS input, generated by L6/1, processed in ETS/ASR ECM | 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 |
