Airbag - Discharged Battery, SRS Diagnostic Codes
90mitsubishi13 SUBJECT:
SRS DIAGNOSTIC CODES - DISCHARGED
BATTERY
NO. TSB-90-52-007
DATE November, 1990
MODEL 1990 Sigma, 1991 3000GT
PURPOSE
This bulletin describes the Supplemental Restraint System (SRS) self diagnostic implementation and service procedures when a discharged battery condition is or has been encountered.
The SRS control unit's built-in diagnostic function monitors the system (battery) voltage delivered to It by the body wiring. When the ignition key is in the ON position and the voltage supplied to the SRS system is low for any reason, including a discharged battery, the control unit will illuminate the SRS Warning lamp continuously while the ignition key is in the ON position. Depending on the voltage, the control unit may store code(s) 32, 41, and 42. The code descriptions are:
32 - The control unit's internal capacitor voltage is below normal.
41 - Ignition voltage circuit # 1 is below normal.
42 - Ignition voltage circuit # 2 is below normal.
BATTERY VOLTAGE CODES STORED
ABOVE 8.55V NO CODES STORED
7.85V to 8.55V CODE 41 and 42 MAY BE STORED
BELOW 7.85V CODES 41 and 42 WILL BE STORED
BELOW 4.0V CODES 32, 41 and 42 WILL BE STORED
The control unit will store these same codes if the vehicle has had a discharged battery. Therefore, when diagnosing code(s) 32, 41, or 42, you should determine whether the vehicle has had a discharged battery.
WARNING: If the SRS warning light first illuminated during normal driving conditions and any code is memorized including 32, 41, and 42, a malfunction was detected by the SRS control unit and the system should be inspected immediately. Follow the troubleshooting procedures outlined in the appropriate service manual.
SERVICE PROCEDURES
WARNING:
Before charging the battery, always turn the ignition swftch OFF and remove the key from the ignition switch. Then disconnect the negative (-) battery cable to avoid possible damage to sensitive electronic components.
Failure to turn the ignftion switch OFF when the negative (-) battery cable is removed, will cause the SRS warning light to illuminate continuously.
If the battery charger is ON when connecting the charger cables to the battery, a spark may occur and cause gases in the battery to ignite, causing severe battery damage and personal injury.
1. Recharge the battery.
2. Reconnect the battery negative (-) cable.
3. Cycle the ignition key ON then OFF at least 10 times to clear codes 41 and 42 from the system's memory.
4. Turn the ignition key to the ON position. Observe the SRS warning lamp. If the SRS warning lamp goes out after about seven seconds no further steps are necessary. If the SRS warning lamp does not turn off after about seven seconds the following instructions must be taken:
4-1. Turn the ignition key OFF. Connect the MUT (Multi-Use Tester).
4-2. Turn the ignition key to the ON position. If code 32 is memorized erase it using the MUT.
4-3. Turn the ignition key to the OFF position.
4-4. Disconnect the MUT from the vehicle.
WARNING: If other diagnosis codes are stored by the SRS system, follow the troubleshooting steps outlined in the appropriate service manual.