Restraint System - Design and Function (Convertible): Diagnosis Volvo C70 I

Diagnostic trouble codes (DTCs)

If the control module detects a fault, it stores a diagnostic trouble code (DTC) and the ROPS warning lamp lights. When the ignition is switched on the lamp should light for approximately 5 seconds and then go out if no diagnostic trouble code (DTC) is stored. The control module can store up to 10 diagnostic trouble codes (DTCs). If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.

Each diagnostic trouble code (DTC) has 4 fault clocks which store data about the start time and, if applicable, the end time for the fault. Absolute start and end times are related to the total time that the system has been powered up. Relative start and end time displays the time the fault occurred or disappeared the last time the ignition was switched on. The absolute time displays the days and the relative time displays the hours, minutes and seconds. If the fault recurs, the end time is rest and the fault code counter (counter 2) counts up by one.

Each diagnostic trouble code (DTC) also has a counter (counter 1) which displays whether the fault is active (permanent) or passive (intermittent). If the counter value is 0 the fault is intermittent and if the value is greater than 0 the fault is permanent. The counter is used during fault-tracing to check if the fault has disappeared or if it remains. The diagnostic trouble code (DTC) status row is updated continuously and switches to intermittent fault if the fault becomes inactive. However, if the fault was passive, but then changes to active, the fault code status row changes to permanent fault.

Scheme 268

Fault data and other information can be read off using the Volvo Scan Tool (ST) connected to the data link connector (DLC) under the center console cover. The Volvo Scan Tool (ST) communicates with control module via a standardized interface.

1. read off and erase stored diagnostic trouble codes (DTCs), counters and frozen values.
2. read the values and status of the system input and output signals.
3. read off the control module identification.
4. reset the system (corresponds to switching the ignition off/on).
5. activate the solenoids.
6. read off the status of the transit safety catch.
7. activate and activates the transit safety catch.
8. read the number of times the roll-over bars have deployed.
9. reset the deployment counter.

A detailed Description of the Volvo Scan Tool (ST) is contained in the Service Manual Volvo Scan Tool (ST).

Scheme 269

Carry out the following to connect the Volvo Scan Tool (ST)

1. ignition off. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
2. install the memory cassette. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
3. connect the Volvo Scan Tool (ST) wiring to the data link connector (DLC). This is located under the center console cover. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
4. ignition on. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
5. power up the Volvo Scan Tool (ST). select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
6. select language, car and group of functions and the relevant system using the multi-function menu. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.
7. select a specific function from the multi-function menu. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to continuously read off the values and status of control module input and output signals. select READ CM: ID to read off the control module P/N.

Reading and erasing diagnostic trouble codes (DTCs)

Stored diagnostic trouble codes (DTCs) and counters can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 10 different faults in the form of diagnostic trouble codes (DTCs). For a list of diagnostic trouble codes (DTCs) and fault-tracing.

Diagnostic trouble codes (DTCs) cannot be erased until all the stored DTCs have been read at least once during an ignition on interval, and the status of all DTCs is intermittent.

Internal diagnostic trouble codes (DTCs) cannot be erased.

Diagnostic trouble codes (DTCs) will be posted for the following fault causes in the roll-over bar cable circuit

1. short-circuits.
2. open-circuits in the circuit.
3. short-circuits to ground.
4. short-circuits to supply voltage.

Diagnostic trouble codes (DTCs) may be stored for the following faults in the ROPS warning lamp circuit

1. open-circuit or short-circuit to ground.
2. short-circuits to supply voltage.

If the control module detects a fault it stores a diagnostic trouble code (DTC) and the SRS indicator lamp lights light lights. The only time the warning lamp does not light is when the cable between the control module and combined instrument panel is short-circuited to ground or if the bulb is blown. When the ignition is switched on the lamp should light for approximately 3 seconds and then go out if no diagnostic trouble code (DTC) is stored. The control module can store up to 10 diagnostic trouble codes (DTCs). If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.

Each diagnostic trouble code (DTC) has 4 fault clocks which store data about the start time and, if applicable, the end time for the fault. Absolute start and end times are related to the total time that the system has been powered up. Relative start and end time displays the time the fault occurred or disappeared the last time the ignition was switched on. The absolute time displays the days and the relative time displays the hours, minutes and seconds. If the fault recurs, the end time is rest and the fault code counter (counter 2) counts up by one.

Each diagnostic trouble code (DTC) also has a counter (counter 1) which displays whether the fault is active (permanent) or passive (intermittent). If the counter value is 0 the fault is intermittent. The counter is used during fault-tracing to check if the fault has disappeared or if it remains. The diagnostic trouble code (DTC) status row is updated continuously and switches to intermittent fault if the fault becomes inactive. However, if the fault was passive, but then changes to active, the fault code status row changes to permanent fault.

Reading off the Volvo on-board diagnostic (OBD) system

Fault data and other information can be read off using the Volvo Scan Tool (ST) connected to the data link connector (DLC) under the center console cover. The Volvo Scan Tool (ST) communicates with control module via a standardized interface. A detailed Description of the Volvo Scan Tool (ST) is contained in the Service Manual Volvo Scan Tool (ST).

Using the Volvo Scan Tool (ST) it is possible to

1. read off and erase stored diagnostic trouble codes (DTCs), counters and frozen values.
2. read the values and status of the system input and output signals.
3. read off the control module identification.
4. reset the system (corresponds to switching the ignition off/on). A detailed Description of the Volvo Scan Tool (ST) is contained in the Service Manual Volvo Scan Tool (ST).

Connecting the Volvo Scan Tool (ST)

Carry out the following to connect the Volvo Scan Tool (ST)

1. ignition off. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
2. install the memory cassette. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
3. connect the Volvo Scan Tool (ST) wiring to the data link connector (DLC). This is located under the center console cover. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
4. ignition on. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
5. power up the Volvo Scan Tool (ST). select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
6. select language, car and group of functions and the relevant system using the multi-function menu. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.
7. select a specific function from the multi-function menu. select DIAGNOSTIC TEST to read and erase diagnostic trouble codes (DTCs). select MONITOR TEST to read off the values and status of the control module input and output signals. Select READ CM: ID to read off the control module P/N.

Stored diagnostic trouble codes (DTCs) and counters can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 10 different faults in the form of diagnostic trouble codes (DTCs). For a list of diagnostic trouble codes (DTCs) and fault-tracing, see SRS Diagnostic Trouble Code (DTC) table .

Diagnostic trouble codes (DTCs) cannot be erased until all the stored DTCs have been read at least once during an ignition on interval, and the status of all DTCs is intermittent.

Internal diagnostic trouble codes (DTCs) cannot be erased.

Diagnostic trouble codes (DTCs) may be stored for the following faults in the airbag modules / seat belt tensioners

1. short-circuits.
2. open-circuits in the circuit.
3. short-circuits to ground.
4. short-circuits to supply voltage.

Diagnostic trouble codes (DTCs) may be stored for the following faults in the SRS warning lamp circuit

1. open-circuit or short-circuit to ground.
2. short-circuits to supply voltage.

The parameter values (status or frozen values) are stored for the following

1. warning lamp status.

SRS diagnostic functions

Diagnostic trouble codes (DTCs)

If the control module detects a fault it stores a diagnostic trouble code (DTC) and the SRS indicator lamp light lights.

The only time the warning lamp does not light is when the cable between the control module and combined instrument panel is short-circuited to ground or if the bulb is blown. When the ignition is switched on the lamp should light for approximately 3 seconds and then go out if no diagnostic trouble code (DTC) is stored.

The control module can store up to 10 diagnostic trouble codes (DTCs).

If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault is stored in the control module. Each diagnostic trouble code (DTC) also has a counter which displays if the fault is active or passive. If the counter value is 0 the control module interprets the fault as being intermittent (passive in other words). If the counter value is greater than 0 the control module interprets the fault as permanent (active).

The counter uses VIDA during fault-tracing which enables easy checking of the fault status; whether it disappears or remains. The diagnostic trouble code (DTC) status row is updated continuously and switches to intermittent fault if the fault is no longer present and permanent if the fault remains.

Reading and erasing diagnostic trouble codes (DTCs)

Diagnostic trouble codes (DTCs) can only be erased when all stored diagnostic trouble codes (DTCs) have been read off at least once. The diagnostic trouble code (DTC) status must also be intermittent (the fault is no longer active).

If the control module detects a fault it stores a diagnostic trouble code (DTC) and the ROPS indicator lamp light lights. When the ignition is switched on the lamp should light for approximately 5 seconds and then go out if no diagnostic trouble code (DTC) is stored. The control module can store up to 10 diagnostic trouble codes (DTCs). If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.

Each diagnostic trouble code (DTC) has a total of 4 fault clocks which store information about the start time and any end time for the fault. Both the absolute start and end time are in relation to the total time that the system has been active via the ignition being on. The relative start and end time show the time the fault occurred or disappeared during the time the ignition was last on. The absolute time shows the day and the relative time shows the hours, minutes and seconds. If the fault reoccurs the end time is reset and the fault code counter (counter 2) counts up by 1.

Each diagnostic trouble code (DTC) has a counter (1) which displays if the fault is passive (intermittent) or active (permanent). If the counter value is 0 the fault is intermittent; if the value is greater than 0 the fault is permanent. The counter is uses during fault-tracing which enables easy checking of the fault status; whether it disappears or remains. The diagnostic trouble code (DTC) status bar is updated continuously and switches to intermittent fault if the fault becomes inactive. However if the fault is passive and switches to active, the diagnostic trouble code (DTC) status bar switches to permanent fault.

Reading off Volvo on-board diagnostic (OBD) system

Fault data and other information can be read off using the VIDA PC which is connected via VCT 2000 to the data link connector (DLC) under the center console cover. The VIDA PC communicates with the control module via a standardized interface.

1. read and erase diagnostic trouble codes (DTCs), counters and frozen values
2. read the value and status of input and output signals.
3. read off control module identification.
4. reset the system (corresponding to ignition off/on).
5. activate the solenoids.
6. read off the status of the transit safety catch.
7. activate and deactivate transit safety catch.
8. read of the number of times the roll-over bars have deployed.
9. reset the deployment counter.

Stored diagnostic trouble codes (DTCs) and counters can read out and erased using this service. The on-board diagnostic (OBD) system can identify 10 different faults in the form of diagnostic trouble codes (DTCs).

Diagnostic trouble codes (DTCs) cannot be erased before all stored DTCs have been read off at least once during the same ignition phase and the status of all DTCs is intermittent.

Internal diagnostic trouble codes (DTCs) cannot be erased.

Diagnostic trouble codes (DTCs) can be stored for the following fault causes in the roll-over bar circuit

1. short-circuited.
2. open-circuit in circuit.
3. short-circuit to ground.
4. short-circuit to supply voltage.

Diagnostic trouble codes (DTCs) can be stored for the following fault causes in the ROPS warning lamp circuit

1. open-circuit or short-circuit to ground.
2. short-circuit to supply voltage.

SRS Diagnostic Trouble Code (DTC) table

A fault can occur in two ways, intermittently or permanently. Intermittent faults are temporary and can recur. Permanent faults are always present. See SRS & ROP DIAGNOSTIC TROUBLE CODES (CONVERTIBLE - 1 OF 3) , SRS & ROP DIAGNOSTIC TROUBLE CODES (CONVERTIBLE - 2 OF 3) , SRS & ROP DIAGNOSTIC TROUBLE CODES (CONVERTIBLE - 3 OF 3) , SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DTC INDEX (CONVERTIBLE - 1998) , SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DTC INDEX (CONVERTIBLE - 1999) or SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DTC INDEX (CONVERTIBLE - 2000-04) .