Test 6 - When DTC No. 21 Or No. 22 Displayed
TEST 6 - WHEN DIAGNOSTIC TROUBLE CODE no. 21 OR No. 22 DISPLAYEDCaution: Never attempt to measure the circuit resistance of the driver's air bag module (squib) even if you are using the specified tester. If the circuit resistance is measured with a tester, accidental driver's air bag deployment will result in serious personal injury.
WIRING DIAGRAM
SDU CONNECTOR
PROCEDURES
NOTE: If combined front impact sensor and driver's air bag module (squib) failure modes simultaneously occur in two places, the preconditions for the respective detection circuits will go out of order. For this reason, both diagnostic trouble codes may not be stored but only one of them may be indicated.
Their relationships are shown in the table above.
Perform TEST 5 Test 5 - When DTC No.11, No. 12 Or No. 13 Is Displayed if it does not become proper even through TEST 6 is executed.
The numbers in the boxes are diagnostic trouble codes numbers.
(1) Turn the ignition key to the 'lock" position, disconnect the negative battery cable and tape the terminal.
Caution: Wait at least 60 seconds after disconnecting the battery cable before doing any further work. The SRS system is designed to retain enough voltage to deploy the air bag even after the battery has been disconnected. Serious injury may result from unintended air bag deployment if work is done on the SRS system immediately after the battery cable is disconnected.
(2) Remove the rear console assembly.
(3) Release the lock of SDU connector in accordance with the following procedure:
In case that there is no notch on the lock lever type 1)
Place a flat tip screwdriver against the lock spring (metal section) of the connector lock lever as shown in the illustration, and push the spring horizontally toward the inside of the unit.
Caution:
1. Do not use excessive force to raise the lock lever.
2. Do not insert the screwdriver into the gap between the lock lever and the lock spring.
In case that there is a notch on the lock lever (Type 2)
Place a flat tip screwdriver against the lock spring (metal section) at the lock lever notch as shown in the illustration, and push the spring toward the unit.
Caution: Do not use excessive force to raise the lock lever.
(1) Disconnect the red 2-pin connector from the SDU while pressing down the lock of the connector.
(2) Connect the red connector (1) of the SRS Check Harness to the SDU instead of the now-disconnected harness-side connector of the SDU, which were connected to the driver's air bag module (squib) through the clock spring.
NOTE: A 3-ohm resistor that corresponds to the resistance of the driver's air bag module (squib) and the wiring resistance is connected between the terminals of the connector (1) of the SRS Check Harness.
(3) Make the double locking.
NOTE: If double locking cannot be made, the connector is incorrectly or incompletely inserted; recheck to insert the connector correctly and securely.
PAGE REFERENCE:
(1) Reconnect negative terminal of battery.
(2) Use the scan tool (when connecting the scan tool (MUT-II) to a vehicle up to 1993 model, use the adapter harness supplied together).
Caution: Before connecting or disconnecting the scan tool, make sure that the ignition switch is placed at the OFF position.
(3) Turn the ignition key to the "ON" position, erase the diagnostic trouble code memory (Refer to TEST 1.)
(4) Return the ignition key from the "ON" to the "LOCK" position and then back to the "ON" position.
(1) Turn the ignition key to the "LOCK" position, disconnect the negative battery cable and tape the terminal.
Caution: Wait at least 60 seconds after disconnecting the battery cable before doing any further work. The SRS system is designed to retain enough voltage to deploy the air bag even after the battery has been disconnected. Serious injury may result from unintended air bag deployment if work is done on the SRS system immediately after the battery cable is disconnected.
(2) Apply a flat tip screwdriver to the lock spring (metallic ponion) of the SDU connector lock lever as illustrated and push it horizontally toward the back of the unit.
Caution:
1. Do not push up the lock lever (green) by force.
2. Never insert a screwdriver between the lock lever (green) and the lock spring (metallic portion).
(3) Disconnect the red 2-pin connector of the SRS Check Harness from the SDU.
(1) Remove the driver's air bag module.
(2) Join the No.2 and No. 7 connectors of the clock spring to SRS Check Harness connector (4) and SRS Check Harness connector (3) respectively.
NOTE: When joining SRS Check Harness connector (4), align its white paint with the hollow portion of the No. 2 connector of the clock spring.
(3) Is the resistance between terminal 1 and terminal 21 of SRS Check Harness connector (5), and between terminal 2 and terminal 22 of SRS Check Harness connector (5) normal?
Standard value: Less than 0.4 Ohms
Caution: Never attempt to measure the circuit resistance of the air bag module (squib) even if you are using the specified tester. If the circuit resistance is measured with a tester, accidental air bag deployment will result in serious personal injury.
NOTE - IMPORTANT:
(1) After repairing the SRS, reconnect the battery cable, erase the diagnostic trouble code memory from the scan tool and check the SRS warning light operation to verify the system functions properly. Refer to TEST 1. Test 1 - SRS Warning Light Does Not Extinguish
(2) SDU = SRS Diagnosis Unit