Troubleshooting

Reading Diagnostic Trouble Codes

1. Turn the ignition key to position "OFF" (OFF).

2. When checking with a tester:

• A) Connect the tester to the diagnostic connector under the instrument panel.

Attention: when connecting or disconnecting the tester "ignition" should be off (ignition key in position "OFF" (OFF)).

• b) Turn on the ignition.

3. Read and write down trouble codes.

4. After completing the test, turn the ignition key to the position "OFF" (OFF) and then disconnect the tester from the diagnostic socket.

Checking the SRS system

1. Check the operation of the SRS indicator on the instrument cluster:

• A) Make sure the indicator lights up when the ignition is turned on.
• b) Make sure that after turning on the ignition, the indicator goes out after about 7 seconds.
• V) If the indicator does not go out, read the trouble codes.

2. Read the diagnostic trouble codes of the SRS system using a tester, then erase the diagnostic codes from the memory of the SRS control unit.

3. Check for the symptom. Start and stop the engine after a few seconds, then read the SRS DTCs again.

A) If there are no fault codes, then the fault was temporary (intermittent).

b) If there is a fault code, check the SRS system in accordance with subsection "Diagnostic codes and probable causes of malfunctions".

Diagnostic codes and probable causes of malfunctions

Caution: A safety mechanism is integrated into each connector of the air bag module's igniter circuit, which prevents accidental shorting of the positive wire to the "mass", when the connector is unplugged (e.g. due to static electricity). Therefore, if the connector is damaged or connected incorrectly, the safety mechanism may remain locked while the connector is connected.

Note:

• - Diagnostic codes tagged "*¹" are automatically erased from memory when the system returns to normal. In this case, the SRS indicator switches to normal operation.
• - Diagnostic codes tagged "*²", when eliminating the malfunctions that caused them, remain in the memory of the control unit (fault history is saved), but the SRS indicator in this case also switches to normal operation.
• - If the car battery is discharged, fault codes No. 41 or No. 42 will be stored in the memory. Check the battery when these trouble codes appear.

Code #14: Analog Acceleration Sensor and Circuits

Note: This fault code appears when a sensor fault is detected (located inside the SRS electronic control unit), abnormal sensor characteristics w abnormal sensor output.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes No. 15 and No. 16: Front airbag safety impact sensor and its circuit

Note: These codes are output when the resistance value between the sensor leads inside the SRS ECU is out of range.

Possible reasons for the appearance of codes:

1. Fault code No. 15:

• Short circuit in safety shock sensor.

2. Fault code No. 16:

• Open circuit in the safety shock sensor.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes №21*¹, №22*¹, #61 >: Driver Front Airbag Module Circuits (electric fuse)

Note: These fault codes appear when the resistance value between the terminals of the airbag module (electric fuse) inside the SRS ECM are out of specification range.

Possible reasons for the appearance of codes:

1. Fault code No. 21:

• Short circuit in the electric fuse circuit of the driver's frontal airbag.
• Short circuit in spiral wire.
• Defective connector safety mechanism, incorrectly connected or damaged wiring harness connector.

2. Fault code No. 22:

• An open in the electric ignition circuit of the front airbag.
• Break in the coiled wire circuit.
• Bad connection or break due to incorrect neutral position of the coiled wire.
• Module connector disconnected (electric fuse) driver's frontal airbag.
• Lack of contact in the connector | wiring harness.

13. Fault code No. 61:

• Short circuit to power supply in the wiring of the driver's frontal airbag igniter.
• Spiral wire defect.
• Damaged wiring or harness connector.

14. Fault code No. 62:

• Short circuit on "mass" in the driver's frontal airbag igniter wiring harness.
• Spiral wire defect.
• Damaged wiring or harness connector.

Probable cause of failure:

• 1. Faulty coiled wire or improper installation (incorrect neutral position).
• 2. Incorrect connection, defective or damaged connectors. Fault in wiring harness or wiring harness connectors.
• 3. Malfunction of the driver's frontal airbag module (electric fuse).
• 4. Malfunction of the SRS electronic control unit.

Codes №24*¹, №25*¹, #64 A: Passenger Front Airbag Module Circuits (electric fuse)

Note: These fault codes appear when the resistance value between the terminals of the front passenger airbag module (electric fuse) inside the ECU, the SRS is out of specification range.

Possible reasons for the appearance of codes:

1. Fault code No. 24:

• Short circuit in the front passenger airbag igniter circuit or in the wiring harness.
• Defective connector safety mechanism, connector damaged or incorrectly connected.

2. Fault code No. 25:

• An open in the front passenger airbag electric ignition circuit or an open in the wiring harness.
• No contact in wiring harness connector.

3. Fault code No. 64:

• Short circuit to power supply in the wiring of the electric fuse of the front passenger airbag.
• Damaged wiring or harness connector.

4. Fault code No. 65:

• Short circuit on "mass" in the wiring of the electric fuse of the front passenger airbag.
• Damaged wiring or harness connector.

Probable cause of failure:

• 1. Incorrect connection, defective or damaged connectors. Fault in wiring harness or wiring harness connectors.
• 2. Malfunction of the front passenger airbag module (electric fuse).
• 3. Malfunction of the SRS electronic control unit.

Codes №26*¹, №27*¹, #66 C: Driver's Pretensioner Circuit (electric fuse)

Note: These trouble codes appear when the resistance value between the terminals of the driver's seat belt pretensioner module (electric fuse) inside the ECU, the SRS is out of specification range.

Possible reasons for the appearance of codes:

1. Fault code No. 26:

• Short circuit in driver's seat belt pretensioner igniter circuit.
• Defective connector safety mechanism, connector damaged or incorrectly connected.

2. Fault code No. 27:

• An open in the electric fuse circuit of the driver's seat belt pretensioner.
• No contact in wiring harness connector.

3. Fault code No. 66:

• Short circuit to power source in the driver's seat belt pretensioner igniter wiring harness.
• Damaged wiring or harness connector.

4. Fault code No. 67:

• Short circuit on "mass" in the driver's seat belt pretensioner igniter wiring harness.
• Damaged wiring or harness connector.

Probable cause of failure:

• 1. Malfunction in wiring harness or wiring harness connectors.
• 2. Malfunction of the driver's seat belt pretensioner module (electric fuse).
• 3. Malfunction of the SRS electronic control unit.

Codes №28*¹, №29*¹, #68 E: Passenger Pretensioner Circuit (electric fuse)

Note: These trouble codes appear when the resistance value between the terminals of the passenger's pretensioner module (electric fuse) inside the ECU, the SRS is out of specification range.

Possible reasons for the appearance of codes:

1. Fault code No. 28:

• Short circuit in passenger seat belt pretensioner igniter circuit.
• Defective connector safety mechanism, connector damaged or incorrectly connected.

2. Fault code No. 29:

• An open in the electric fuse circuit of the passenger's seat belt pretensioner.
• No contact in wiring harness connector.

3. Fault code No. 68:

• Short circuit to power supply in passenger seat belt pretensioner igniter wiring harness.
• Damaged wiring or harness connector.

4. Fault code No. 69:

• Short circuit on "mass" in the passenger seat belt pretensioner igniter wiring harness.
• Damaged wiring or harness connector.

Probable cause of failure:

• 1. Malfunction in wiring harness or wiring harness connectors.
• 2. Malfunction of passenger seat belt pretensioner module (electric fuse).
• 3. Malfunction of the SRS electronic control unit.

Codes #31 and #32: ECU Capacitor and Circuit

Note: These codes are output when the voltage at the capacitor terminals remains higher (code number 31) or below (code number 32) set value for 5 seconds or longer.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Note: code #32 does not appear if codes #41 and #42 are present, indicating a drop in battery voltage.

Code #34²: SRS-ECU electrical connector retainer control circuit

Note: This DTC is set when there is poor contact at the SRS ECM connector.

Probable cause of failure:

• 1. Fault (bad contact) in the SRS control unit connector or an open circuit in the wiring harness.
• 2. Malfunction of the SRS electronic control unit.

Code No. 35: SRS electronic control unit (with deployed airbag)

Note: This fault code is displayed after the driver's airbag has been deployed (code number 35) or passenger airbags (code no. 46). If the airbags did not deploy, and this code is present, then the cause of the malfunction is located inside the SRS electronic control unit.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Code No. 41²: IG1 ignition switch supply circuit (A).

Note: This fault code is output if the voltage between terminal IG1 (A) (the corresponding terminal of the connector of the SRS control unit) And "weight" remains less than the set value (9 V) for 5 seconds or longer. However, if the voltage returns to normal, then DTC No. 41 will be automatically erased from memory and the SRS indicator will turn off.

Probable cause of failure:

• 1. Fault (bad contact) in the wiring harness connector or an open circuit in the wiring harness.
• 2. Malfunction of the SRS electronic control unit.

Code No. 42²: IG1 ignition switch supply circuit (IN).

Note: This fault code is output if the voltage between terminal IG-i (IN) (the corresponding terminal of the connector of the SRS control unit) And "weight" remains less than the set value (9 V) for 5 seconds or longer. But, if the voltage returns to normal, then fault code No. 42 will be automatically erased from memory and the SRS indicator will turn off.

Probable cause of failure:

• 1. Fault (bad contact) in the connector, wiring harness, or an open circuit in the wiring harness.
• 2. Malfunction of the SRS electronic control unit.

Note: if codes No. 41 and No. 42 are displayed at the same time, then it is necessary, first of all, to check the condition of the battery.

Code No. 43²: SRS indicator control circuit (The indicator does not light up)

Note: The SRS ECM controls the operation of the SRS indicator and outputs this DTC if there is an open circuit for 5 seconds and the indicator is off.

Probable cause of failure:

• 1. Fault (bad contact) in the wiring harness connector or an open circuit in the wiring harness.
• 2. Bulb burnt out.
• 3. Malfunction of the SRS electronic control unit.
• 4. Faulty instrument cluster.

Code No. 43²: SRS indicator control circuit (Lamp does not turn off)

Note: This fault code is output when there is a short circuit to the "mass" wires between the SRS indicator and the SRS electronic control unit.

Probable cause of failure:

• 1. Fault (bad contact) in the wiring harness connector or an open circuit in the wiring harness.
• 2. Malfunction of the SRS electronic control unit.
• 3. Faulty instrument cluster.

Code No. 44²: SRS indicator control circuit

Note: This DTC is displayed if there is a short circuit in the SRS indicator control circuit, or the control transistor inside the SRS control unit has failed.

Probable cause of failure:

• 1. Malfunction of the SRS electronic control unit.
• 2. Malfunction in the wiring harness connector.

Code #45: Chains of indelible memory (EEPROM) inside the SRS electronic control unit

Note: this code is displayed when the non-erasable memory fails (electrically programmable read-only memory (EEPROM)) inside the SRS electronic control unit.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes #51 or #52: Driver Front Airbag Module Circuit (ignition control circuit)

Note: this code is issued if a short circuit occurs (№ 51) or break (№ 52) in the electric igniter control circuit of the driver's frontal airbag module.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes #54 or #55: Passenger's Frontal Airbag Module Circuit (ignition control circuit)

Note: This code is displayed if a short circuit occurs (№54) or break (№55) in the electric igniter control circuit of the passenger's frontal airbag module.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes #56 or #57: Driver's Pretensioner Circuit (ignition control circuit)

Note: This code is displayed if a short circuit occurs (№56) or break (№57) for the purpose of controlling the driver's seat belt pretensioner.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Codes #58 or #59: Passenger Pretensioner Circuit (ignition control circuit)

Note: This code is displayed if a short circuit occurs (№56) or break (№57) in the passenger seat belt pretensioner control circuit.

Probable cause of failure:

Malfunction of the SRS electronic control unit.

Symptoms in the absence of fault codes

In the following cases, the likely cause of the malfunction is: either a malfunction (bad contact) in socket or. an open circuit in the wiring harness, or a malfunction of the SRS electronic control unit.

1. If fault codes cannot be output (communication with the tester is not possible) for all electronic systems of the vehicle, then there is probably no power supply in the diagnostic circuit (It is also possible that there is no contact with "weight").

2. If fault codes cannot be output (communication with the tester is not possible) only for the SRS system, then there is probably an open circuit in the output signal of the SRS diagnostic line, or an open circuit in the power supply (It is also possible that there is no contact with "weight").

3. If the SRS indicator does not turn off, then there is probably a short in the wiring between the SRS indicator and the SRS ECM.

Symptoms in the absence of fault codes

In the following cases, the likely cause of the malfunction is: either a malfunction (bad contact) in the connector or an open circuit in the wiring harness, or a malfunction of the SRS electronic control unit.

1. If fault codes cannot be output (communication with the tester is not possible) for all electronic systems of the vehicle, then there is probably no power supply in the diagnostic circuit (It is also possible that there is no contact with "weight").

2. If fault codes cannot be output (communication with the tester is not possible) only for the SRS system, it is likely that there is an open circuit in the output signal of the SRS diagnostic line, or an open circuit in the power supply (It is also possible that there is no contact with "weight").

3. If the SRS indicator does not turn off, then there is probably a short in the wiring between the SRS indicator and the SRS ECU.