CHECK
Table showing the key positions that the control module's power supplies are active in respectively passive in.
X=Active
| Key position | 30-feed | +75 supply accessory | Power supply Ignition on | Crank |
|---|---|---|---|---|
| 0 | X | |||
| I | X | X | ||
| II | X | X | X | |
| III | X | X | X |
Conditions
- Breakout box connected to central electronic module (CEM).
- Or loose Start control module (SCU).
Check 1
With breakout box connected to central electronic module (CEM)
Measure the voltage on the pins that correspond to the different voltage supplies from the Start control module (SCU) for all key positions, and check that it corresponds with the table that describes in which key position each voltage supply is active.
Check, using Volvo's diagnostic tool, that the key has been approved by the immobilizer.
Check 2
With loose Start control module (SCU)
Measure the resistance between the control module pins in the different key positions. Compare the result with the table that describes in which position each voltage supply is active. Open switches have a resistance of at least 100 kohms. Closed switches have a resistance of a maximum of 100 mohms.
Scheme 248
Scheme 249
Note. It is important to connect the breakout box and check the ground terminals before taking readings.
Other information
- see «CONNECTING THE BREAKOUT BOX»(ref-500264-S04282868862012091100000) .
| U= | DC voltage in volts (V) | U AC = | AC voltage in volts (V) |
|---|---|---|---|
| U bat = | Battery voltage (V) | F = | Frequency in Hertz (Hz) |
| U low = | Voltage approximately 0 V | % duty = | Duty cycle (pulse ratio) as a percentage (%) |
| T = | Time in milliseconds (ms) |
| Connector A, terminals #A1-#A4 The following values are measured between the relevant terminal in column 1 and terminal #A1 (power ground) unless otherwise stated. Check the ground terminals before starting to take readings with the breakout box. |
| Terminal in the breakout box | Terminal in connector | Signal type | Ignition off | Ignition on | Other | ||
|---|---|---|---|---|---|---|---|
| Activated | Not activated | Activated | Not activated | ||||
| #51 | #A1 | Power ground | U low | U low | U low | U low | |
| #52 | #A2 | 30-supply to the accessory electronic module (AEM) | U bat | U bat | U bat | U bat | |
| #53 | #A3 | Communication CAN L low speed network | 1.5 - 2.5 V | 1.5 - 2.5 V | 1.5 V, at communication | ||
| #54 | #A4 | Communication CAN_H low speed network | 2.5 - 3.5 V | 2.5 - 3.5 V | 3.5 V, at communication | ||
| Connector B, terminals #B1 - #B50 The following values are measured between the relevant terminal in column 1 and terminal #A1 (power ground) unless otherwise stated. Check the ground terminals before starting to take readings with the breakout box. |
| Terminal in the breakout box | Terminal in connector | Signal type | Ignition off | Ignition on | Other | ||
|---|---|---|---|---|---|---|---|
| Activated | Not activated | Activated | Not activated | ||||
| #1 | #B1 | Remote start, power supply | U bat | U bat | U bat | U bat | Remote start module always activated |
| #2 | #B2 | Remote start, ground | U low | U low | U low | U low | |
| #3 | #B3 | Remote start, digital input signal | U low | U = 3 V or U = 5 V | U low | U = 3 V or U = 5 V | Pulses with variable time periods |
| #4 | #B4 | Electric engine block heater, ground | U low | U low | U low | U low | |
| #5 | #B5 | Electric engine block heater, control signal | U bat | U low | U bat | U low | |
| #6 | #B6 | ||||||
| #7 | #B7 | ||||||
| #8 | #B8 | ||||||
| #9 | #B9 | ||||||
| #10 | #B10 | ||||||
| #11 | #B11 | Carphone mute, digital input signal | U bat | U bat | U low | U bat | |
| #12 | #B12 | ||||||
| #13 | #B13 | ||||||
| #14 | #B14 | U bat | U bat | PWM = 30% - 70% | PWM = 30% - 70% | Pulse width modulation (PWM) signal | |
| #15 | #B15 | Alarm signal P0, digital output signal | U low | U bat | U bat | U bat | Status "Ignition off " on condition the ignition key is out |
| #16 | #B16 | Alarm signal P1, digital output signal | U low | U bat | U bat | U bat | Status "Ignition off " on condition the ignition key is out |
| #17 | #B17 | ||||||
| #18 | #B18 | ||||||
| #19 | #B19 | ||||||
| #20 | #B20 | ||||||
| #21 | #B21 | ||||||
| #22 | #B22 | ||||||
| #23 | #B23 | ||||||
| #24 | #B24 | ||||||
| #25 | #B25 | ||||||
| #26 | #B26 | ||||||
| #27 | #B27 | ||||||
| #28 | #B28 | ||||||
| #29 | #B29 | ||||||
| #30 | #B30 | ||||||
| #31 | #B31 | ||||||
| #32 | #B32 | ||||||
| #33 | #B33 | Alarm signal S0, digital output signal | U bat | U bat | U low | U bat | |
| #34 | #B34 | Alarm signal S1, digital output signal | U low | U low | U bat | U low | |
| #35 | #B35 | ||||||
| #36 | #B36 | ||||||
| #37 | #B37 | ||||||
| #38 | #B38 | ||||||
| #39 | #B39 | ||||||
| #40 | #B40 | ||||||
| #41 | #B41 | ||||||
| #42 | #B42 | ||||||
| #43 | #B43 | ||||||
| #44 | #B44 | ||||||
| #45 | #B45 | ||||||
| #46 | #B46 | ||||||
| #47 | #B47 | ||||||
| #48 | #B48 | ||||||
| #49 | #B49 | ||||||
| #50 | #B50 | ||||||