DIAGNOSTIC FUNCTIONS
See: DIAGNOSTIC FUNCTIONS
Note. All diagnostic communication regarding the gas discharge lamp module (GDL) is handled via the central electronic module (CEM).
DIAGNOSTIC TROUBLE CODES (DTCS)
If the central electronic module (CEM) detects a fault in the headlight system, it stores a diagnostic trouble code.
A fault detected during the last driving cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault.
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.
READING AND ERASING DIAGNOSTIC TROUBLE CODES (DTCS)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults are defined as intermittent. An operating cycle involves ignition on, the vehicle speed exceeding 20 km/h and the ignition being switched off.
READING OUT AND ERASING DIAGNOSTIC TROUBLE CODES
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
See: DIAGNOSTIC FUNCTIONS
Note. The master unit for the immobilizer system is the central electronic module (CEM). This is also the module which stores diagnostic trouble codes (DTC) for faults in the immobilizer system.
DIAGNOSTIC FUNCTIONS (2004-2006)
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. This control module can store up to six diagnostic trouble codes (DTCs), the three first and the three latest.
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 35 different faults in the infotainment control module (ICM). These are stored as diagnostic trouble codes (DTCs). This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2007)
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. This control module can store up to 6 diagnostic trouble codes (DTCs), the three first and the three latest.
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 33 different faults in the infotainment control module (ICM). These are stored as diagnostic trouble codes (DTCs). This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes can only be erased once all the diagnostic trouble codes have been read out at least once.
DIAGNOSTIC FUNCTIONS (2008)
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. This control module can store up to 6 diagnostic trouble codes (DTCs), the three first and the three latest.
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 33 different faults in the infotainment control module (ICM). These are stored as diagnostic trouble codes (DTCs). This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2009-2011)
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. This control module can store up to 6 diagnostic trouble codes (DTCs), the three first and the three latest.
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains in the control module.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 36 different faults in the infotainment control module (ICM). These are stored as diagnostic trouble codes (DTCs). This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2005, 2006)
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is generated. The control module can store up to 10 trouble codes. A fault that is detected during the most recent operating cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is generated. The control module can store up to 10 trouble codes. A fault that is detected during the most recent operating cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is generated. The control module can store up to 10 trouble codes. A fault that is detected during the most recent operating cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is generated. The control module can store up to 10 trouble codes. A fault that is detected during the most recent operating cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2005-2007)
Note. The keyless vehicle module (KVM) has internal diagnostics. It continuously monitors most of the inputs and outputs. It does not monitor the outputs for the antennas. The antennas are checked every 5th operating cycle when vehicle speed exceeds 20 km/h (11 mph).
A diagnostic trouble code (DTC) is stored if the keyless vehicle module (KVM) detects a fault. The keyless vehicle module (KVM) can identify 42 different faults. If for any reason a fault should disappear after the diagnostic trouble code (DTC) has been stored, information about the diagnostic trouble code (DTC) remains in the keyless vehicle module (KVM).
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 42 different faults in the keyless vehicle module (KVM). These are stored as diagnostic trouble codes (DTCs).
This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2008-2011)
Note. The keyless vehicle module (KVM) has internal diagnostics. It continuously monitors most of the inputs and outputs. It does not monitor the outputs for the antennas. The antennas are checked every 5th operating cycle when vehicle speed exceeds 20 km/h (11 mph).
A diagnostic trouble code is generated if Keyless vehicle module (KVM) detects a malfunction.
Keyless vehicle module (KVM) can identify 34 different malfunctions. Should a problem disappear for some reason after the diagnostic trouble code was generated, information about the diagnostic trouble code remains in the memory of Keyless vehicle module (KVM).
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic system can identify 34 different faults in the keyless vehicle module (KVM). These are stored as diagnostic trouble codes (DTCs).
This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault.
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.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.
RING BREAK DIAGNOSTICS
General
This function is important when fault-tracing the MOST network. Ring break diagnostics are used when there is an open-circuit in the MOST network and diagnostic trouble code (DTC) ICM-DC02 has been stored in the infotainment control module (ICM).
A ring break diagnosis means that all control modules send a message to the infotainment control module (ICM) in reverse order to their locations in the MOST network. This means that the media player module (MPM) or integrated audio module (IAM) transmits first, not last. The control module which does not work will not transmit a response to the infotainment control module (ICM). This also means that all control modules connected before the broken control module will not be able to transmit a message to the infotainment control module (ICM).
The same applies in the event of an open-circuit in the fiber optic cable in the MOST network. None of the control modules before the open-circuit will be able to send their message to the infotainment control module (ICM). The infotainment control module (ICM) is then able to calculate the position of the open-circuit from the incoming messages.
HINT: It is important to know which control modules are connected and in what order to identify the control module which sends each message.
Scheme 180
Example 1
A MOST network contains all 9 control modules. There is an open-circuit in the cable between the traffic message channel module (TMC) and the audio module (AUD).
During the ring break diagnostic, the infotainment control module (ICM) receives responses in reverse order to the order of the control modules on the MOST network. Those that are before the audio module (AUD) cannot respond to the infotainment control module (ICM). The infotainment control module (ICM) receives responses up to position five and presents the value 5.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
Example 2
A MOST network to which the subwoofer module (SUB) is not connected, however the other eight control modules are connected.
There is an open-circuit in the cable between the traffic message channel module (TMC) and the audio module (AUD).
During the ring break diagnostic, the response value from all the control modules before the subwoofer module (SUB) will be one less than example 1 when all control modules are connected. The infotainment control module (ICM) receives responses up to position four and presents the value 4.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
General
This function is important when fault-tracing the MOST network. Ring break diagnostics are used when there is an open-circuit in the MOST network and diagnostic trouble code (DTC) ICM-DC02 has been stored in the infotainment control module (ICM).
During a ring break diagnostic, all control modules transmit a message to the infotainment control module (ICM) in reverse order to their position on the MOST network. This means that the Integrated Audio Module (IAM) transmits first, not last.
The control module which is not working will not transmit a response to the infotainment control module (ICM). This also means that the control modules which are connected before the defective control module will be unable to transmit a message to the infotainment control module (ICM).
The same applies in the event of an open-circuit in the fiber optic cable in the MOST network. None of the control modules before the open-circuit will be able to send their message to the infotainment control module (ICM). The infotainment control module (ICM) is then able to calculate the position of the open-circuit from the incoming messages.
HINT: It is important to know which control modules are connected and in what order to identify the control module which sends each message.
Scheme 181
Example 1
A MOST network contains all 8 control modules. There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the Audio module (AUD).
During the ring break diagnostic, the infotainment control module (ICM) receives responses in reverse order to the order of the control modules on the MOST network.
Those that are before the audio module (AUD) cannot respond to the infotainment control module (ICM). The infotainment control module (ICM) receives responses up to position five and presents the value 5.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
Example 2
A MOST network to which the subwoofer module (SUB) is not connected, however the other eight control modules are connected.
There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the audio module (AUD).
During the ring break diagnostic, the response value from all the control modules before the subwoofer module (SUB) will be one less than example 1 when all control modules are connected. The infotainment control module (ICM) receives responses up to position four and presents the value 4.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
General
This function is important when fault-tracing the MOST network. Ring break diagnostics are used when there is an open-circuit in the MOST network and diagnostic trouble code (DTC) ICM-DC02 has been stored in the infotainment control module (ICM).
During a ring break diagnostic, all control modules transmit a message to the infotainment control module (ICM) in reverse order to their position on the MOST network. This means that the Integrated Audio Module (IAM) transmits first, not last.
The control module which is not working will not transmit a response to the infotainment control module (ICM). This also means that the control modules which are connected before the defective control module will be unable to transmit a message to the infotainment control module (ICM).
The same applies in the event of an open-circuit in the fiber optic cable in the MOST network. None of the control modules before the open-circuit will be able to send their message to the infotainment control module (ICM). The infotainment control module (ICM) is then able to calculate the position of the open-circuit from the incoming messages.
HINT: It is important to know which control modules are connected and in what order to identify the control module which sends each message.
Scheme 182
Example 1
A MOST network contains all 8 control modules. There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the Audio module (AUD).
During the ring break diagnostic, the infotainment control module (ICM) receives responses in reverse order to the order of the control modules on the MOST network.
Those that are before the audio module (AUD) cannot respond to the infotainment control module (ICM). The infotainment control module (ICM) receives responses up to position five and presents the value 5.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
Example 2
A MOST network to which the subwoofer module (SUB) is not connected, however, the other seven control modules are connected.
There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the audio module (AUD).
During the ring break diagnostic, the response value from all the control modules before the subwoofer module (SUB) will be one less than example 1 when all control modules are connected. The infotainment control module (ICM) receives responses up to position four and presents the value 4.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
General
This function is important when fault-tracing the MOST network. Ring break diagnostics are used when there is an open-circuit in the MOST network and diagnostic trouble code (DTC) ICM-DC02 has been stored in the infotainment control module (ICM).
During ring break diagnostics, all control modules transmit a message to the infotainment control module (ICM) in reverse order to their position on the MOST network. This means that the Accessory USB unit (AUU) transmits first, not last.
The control module which is not working will not transmit a response to the infotainment control module (ICM). This also means that the control modules which are connected before the defective control module will be unable to transmit a message to the infotainment control module (ICM).
The same applies with an open circuit on the optical cable in the MOST network. No control module before the open circuit can send messages to the Infotainment control module (ICM).
By means of the incoming messages, the Infotainment control module (ICM) can determine where the open circuit has taken place.
HINT: It is important to know which control modules are connected and in what order to identify the control module which sends each message.
Scheme 183
Example 1
A MOST network contains all 7 control modules. There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the Audio module (AUD).
During the ring break diagnostic, the infotainment control module (ICM) receives responses in reverse order to the order of the control modules on the MOST network.
Those that are before the audio module (AUD) cannot respond to the infotainment control module (ICM). The infotainment control module (ICM) receives responses up to position four and presents the value 4.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK.
Example 2
A MOST network to which the Phone module (PHM) is not connected, however the other six control modules are connected.
There is an open-circuit in the cable between the Remote Digital Audio Receiver (RDAR) and the audio module (AUD).
Using ring break diagnostics, all control modules before the Phone module (PHM) will have minus one on its response compared to example 1 where all control modules were connected.
Infotainment control module (ICM) receives responses up to position three and presents the value 3.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK.
DIAGNOSTIC FUNCTIONS (2004-2007)
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults are defined as intermittent.
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.
If a fault is no longer permanent, the diagnostic trouble code (DTC) remains as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detect a fault, a diagnostic trouble code is stored. A fault that was detected during the last driving cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Should a fault disappear for any reason after being stored in the control module as a permanent diagnostic trouble code, the information remains stored in the control module. If a fault is no longer permanent, the diagnostic trouble code remains as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. Certain functions are not available until the diagnostic trouble codes have been erased.
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is stored. A fault that was detected during the last driving cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Should a fault disappear for any reason after being stored in the control module as a permanent diagnostic trouble code, the information remains stored in the control module. If a fault is no longer permanent, the diagnostic trouble code remains as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Note. Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. The control module can store a number of diagnostic trouble codes (DTCs).
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been stored in the control module, information about the fault remains in the control module. If a fault is no longer permanent the diagnostic trouble code (DTC) remains as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
DIAGNOSTIC FUNCTIONS (2004-2008)
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. There are approximately 18 diagnostic trouble codes (DTCs) for standard carphones, approximately 25 for carphones with Volvo On Call. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults which are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
READING OFF EXTENDED DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are called frozen values.
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
If the control module detects a fault, a diagnostic trouble code is stored. A fault that was detected during the last driving cycle is defined as permanent. Other faults that are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are called frozen values.
Note. The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults which are detected are defined as intermittent.
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.