| All values measured to ground unless otherwise noted | |||
| A1 | |||
| 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 F1f19 |
| 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 F1f30 |
| 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 | |
| 1A.14-16 | Pin not used | ||
| 1A.17 | Serial port I, data output to A/C pushbutton module | Ignition on 6-8 VDC | |
| 1A.18 | Voltage coded signal input from horn switch and multi fuction buttons in steering wheel | No reliable test | Use SDS to test |
| 1B.1 | Circuit D+ power input | Ignition on 12 VDC when engine is running 0 VDC when engine is not running |
|
| 1B.2,3 | Pins not used | ||
| 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 |
|
| 1B.5,6 | Pins not used | ||
| 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 | |
| 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 |
| 2B.1 | CAN-Bus (low side). High speed data transfer bus input and output, shares data with other ECMs | No reliable test. Check continuity to other ECMs approx. 5 VAC when data is on bus |
|
| 2B.2 | CAN-Bus (high side) | ||
| 2C.1 | Circuit 15R input, SRS malfunction indicator | 12 VDC ignition on | See pin 2C.2 |
| 2C.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 |
| 2D.1 | Ground output to Voice Control System (VCS) switch | Approx. 0 Ohms to ground | |
| 2D.2 | VCS switch ground signal input | ??? | |
| 2D.3 | VCS switch ground signal input | ??? | |
| 2E-2K | Connectors and pins not used | ||
| 2L.1 | 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 | |
| 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 | 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 |
| 2M | Connector and pins not used | See pin 2M.1 | |
| 2N.1 | Horn contact signal output | ??? | |
| 2N.2 | Selector lever position "P" or "N" signal input | ??? | |