| All values measured to ground unless otherwise noted | |||
| N54 | |||
| 1 | Interior mirror locking confirmation signal output | Using IR transmitter, lock at interior mirror, Red indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 2 | Interior mirror unlocking confirmation signal output | Using IR transmitter, unlock at interior mirror, Green indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 3 | Driver side locking confirmation signal output | Using IR transmitter, lock at driver side, Red indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 4 | Trunk infrared sensor signal input | Using IR transmitter, lock at trunk, keep button depressed, monitor voltage. release button, voltage will raise approx. 0.4 VDC | |
| 5 | Trunk lid IR receiver voltage supply output | 12 VDC at all times | same as pin 12 |
| 1.6-7 | Pins not used | ||
| 8 | Interior mirror door infrared sensor signal input | Using IR transmitter, lock at interior mirror, keep button depressed, monitor voltage. release button, voltage will raise approx. 0.4 VDC | |
| 9 | Circuit 30 main power input | 12 VDC at all times | Feed from F1f27 |
| 10 | Driver side unlocking confirmation signal output | Using IR transmitter, unlock at driver side, Green indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 11 | Unlock command SN1 signal output |
Use remote control Lock vehicle 12 VDC Unlock vehicle < 1 VDC |
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| 12 | Left front door IR receiver voltage supply output | 12 VDC at all times | same as pin 5 |
| 13 | Sensor ground signal output | Approx. 0 Ohms to ground | same as pin 24 |
| 14 | Circuit 15 main power input | Ignition on 12 VDC | Feed from F1f23 |
| 1.15-17 | Pins not used | ||
| 18 | Left front door infrared sensor signal input | Using IR transmitter, lock at driver side, keep button depressed, monitor voltage. release button, voltage will raise approx. 0.4 VDC | |
| 19 | DTC diagnostic output. Also input for HHT data and tests. | Ignition on approx. 10-14 VDC | |
| 20 | Trunk unlocking confirmation signal output | Using IR transmitter, unlock at trunk, Green indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 21 | Trunk locking confirmation signal output | Using IR transmitter, lock at trunk, Red indicator flashes. Use scope 12 Vpp when confirmation occurs |
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| 22 | Pin not used | ||
| 23 | Lock command SN2 signal output to PSE system |
Use remote control Unlock vehicle 12 VDC Lock vehicle < 1 VDC |
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| 24 | Sensor ground signal output | Approx. 0 Ohms to ground | same as pin 13 |
| 1.25-26 | Pins not used | ||
| 27 | Main ground to W7 | Approx. 0 Ohms to ground | |
| N54/1 | |||
| 1.1 | Main ground to W19 | Approx. 0 Ohms to ground | |
| 1.2 | Sensor ground signal output | Approx. 0 Ohms to ground | |
| 1.3 | Unlock command SN1 signal ouput, generated from RCL system, to activate PSE module | Use remote control Lock vehicle 12 VDC Unlock vehicle < 1 VDC |
Initialized with IR transmitter or manually with key |
| 1.4 | Lock command SN2 signal output, generated from RCL system, to activate PSE module | Use remote control Unlock vehicle 12 VDC Lock vehicle < 1 VDC |
Initialized with IR transmitter or manually with key |
| 1.5-7 | Pins not used | ||
| 1.8 | Unlock command driver side / trunk signal input | Disconnect A37 plugs, in quiescent condition > 20 kOhms in unlock mode <40 Ohms |
Initialized from S87/1 and S88/2 or IR transmitter |
| 1.9 | Circuit 15 main power input | Ignition on 12 VDC | Feed from F1f23 |
| 1.10 | Lock command driver side / trunk signal input | Disconnect A37 plugs, in quiescent condition > 20 kOhms in unlock mode <60 Ohms |
Initialized from S87/1 and S88/2 or IR transmitter |
| 1.11 | Interior mirror IR receiver voltage supply output | 5 VDC at all times | |
| 1.12 | Circuit 30 main power input | 12 VDC at all times | Feed from F1f27 |
| 1.13-18 | Pins not used | ||
| 2.2 | CAN-Bus (high 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. |
Also other ECMs can cause CAN-Bus DTCs. |
| 2.1 | CAN-Bus (low side). High speed data transfer bus input and output, shares data with other ECMs. | Disconnect plug 2 from N54/1. Approx. 120 Ohms across pins 2.H and 2.L | HHT is also used for CAN diagnosis |
| 3.1 | Transponder coil activation signal output and ignition key ID code signal input |
ECM disconnected, ignition on , use scope or storage DMM, measure to pin 3.2 approx. 125 kHz cycle, duration 0.2-0.8 sec. |
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| 3.2 | Transponder coil signal low side output, shield | ||
| Note | For further tests, especially pneumatic system, refer to DM Body and Accessories | HHT is also used for diagnosis. Refer to DM Body and Accessories |
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