DTC B1031 Driver Loop Energy Reserve Feed Open. Isuzu S/T Isuzu

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 1997 🢒 S/T Isuzu - 2WD 🢒 Restraints 🢒 SIR 🢒 DTC B1031 Driver Loop Energy Reserve Feed Open

Circuit Description

During the Continuous Monitoring tests the supplemental restraint Diagnostic Energy Reserve Module (DERM) monitors the voltage at the driver source sense terminal A5. When the circuit is operating normally, the measured voltage will be less than the Driver 36 VLR. If the Driver 36 VLR circuit opens, the voltage measured at the driver source sense will decrease to less than Ignition 1 voltage. When the voltage measured at the driver source sense is within a specified range of Ignition 1 for 500 milliseconds, DTC B1031 is set.

Conditions for Setting the DTC

The voltage measured at the Driver Source Sense terminal A5 is within a specified range of ignition 1 for 500 milliseconds during continuous monitoring.

Action Taken When the DTC Sets

The DERM turns on the AIR BAG warning lamp and sets a diagnostic trouble code.

Conditions for Clearing the DTC

The voltage measured at the Driver Source Sense terminal A5 is outside the specified range of Ignition 1 which sets the diagnostic trouble code, for 500 milliseconds.

Diagnostic Aids

An intermittent condition may be caused by one of the following:

•	A poor connection at the supplemental restraint arming sensor

•	A poor connection at the supplemental restraint arming sensor jumper harness electrical connector terminal B

•	A poor connection at the supplemental restraint arming sensor jumper harness electrical connector terminal C

•	A poor connection at the DERM terminal A4

•	A poor connection at the DERM terminal A5

•	An open in CKT 236

•	An open in CKT 1400

•	An open inside the supplemental restraint arming sensor

Test Description

Start at the SRS Diagnostic System Check for all diagnosis.

This test checks for an open in the Driver 36 VLR circuit between the DERM and the supplemental restraint arming sensor connector.

This test checks for a open in the Driver 36 VLR circuit between the supplemental restraint arming sensor jumper harness connector and the DERM.

This test checks for high resistance, but not an open, in the Driver Source Sense circuit between the DERM and supplemental restraint arming sensor electrical harness connector.

This test checks for high resistance, but not an open, in the Driver Source Sense circuit between the DERM and the supplemental restraint arming sensor jumper harness electrical connector C110.

This test checks for a short from the Driver Source Sense circuit to B+.

When measurements are requested in this table, use J 39200 Digital Multimeter with correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections in Section 8A4. When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair.

DTC B1031- Driver Loop Energy Reserve Feed Open

Step	Action	Value	Yes	No
1	Was the SRS Diagnostic System Check performed?	--	Go to Step 2	Go to SRS Diagnostic System Check
2	Turn OFF the ignition switch. Disconnect the yellow 2-way electrical connector C214 at the base of the steering column. Disconnect the supplemental restraint arming sensor. Check for proper connection to the supplemental restraint arming sensor at terminals B and C. Is the supplemental restraint arming sensor electrical harness connector damaged or corroded?	--	Go to Step 3	Go to Step 4
3	Replace the supplemental restraint arming sensor electrical harness connector. Has the connector been replaced?	--	Go to Step 5	--
4	Check for proper connection to the supplemental restraint arming sensor at terminals B and C. Are the supplemental restraint arming sensor terminals damaged or corroded?	--	Go to Step 6	Go to Step 7
5	Check for proper connection to the supplemental restraint arming sensor at terminals B and C. Are the supplemental restraint arming sensor terminals damaged or corroded?	--	Go to Step 6	Go to Step 27
6	Replace the supplemental restraint arming sensor. Refer to Supl Rst Arming Sensor . Has the supplemental restraint arming sensor been replaced?	--	Go to Step 27	--
7	Disconnect the DERM. Check for proper connection to the DERM at terminals A4 and A5. Is the DERM electrical harness connector damaged or corroded?	--	Go to Step 8	Go to Step 9
8	Repair the DERM electrical harness connector. Has the connector been repaired?		Go to Step 10
9	Check for proper connection to the DERM at terminals A4 and A5. Are the DERM terminals damaged or corroded?		Go to Step 11	Go to Step 12
10	Check for proper connection to the DERM at terminal A4 and A5. Are the DERM terminals damaged or corroded?		Go to Step 11	Go to Step 27
11	Replace the DERM. Refer to Supl Rst Diagnostic Energy Reserve Module . Has the DERM been replaced?		Go to Step 27
12	Measure the resistance from the DERM electrical harness connector terminal A4 to the supplemental restraint arming sensor electrical harness connector terminal B. Is the resistance less than the specified value?	5 ohms	Go Step 18	Go to Step 13
13	Disconnect the supplemental restraint arming sensor jumper harness electrical connector C110. Is the connector damaged or corroded?	--	Go to Step 14	Go to Step 15
14	Repair the supplemental restraint arming sensor jumper harness electrical connector C110. Has the connector been repaired?	--	Go to Step 27	--
15	Measure the resistance of circuit 236 from the DERM electrical harness connector terminal A4 to the supplemental restraint arming sensor jumper harness electrical connector C110 terminal B. Is the resistance less than the value specified?	5 ohms	Go to Step 16	Go to Step 17
16	Repair the open in circuit 236 in the supplemental restraint arming sensor jumper harness. Has the open circuit been repaired?	--	Go to Step 27	--
17	Repair the open in circuit 236 in the SRS wiring harness. Has the open circuit been repaired?	--	Go to Step 27	--
18	Measure the resistance circuit 1400 from the DERM electrical harness connector terminal A5 to the supplemental restraint arming sensor electrical harness connector terminal C. Is the resistance less than the value specified?	5 ohms	Go to Step 24	Go to Step 19
19	Disconnect the supplemental restraint arming sensor jumper harness electrical connector C110. Is the connector terminal C damaged or corroded?	--	Go to Step 20	Go to Step 21
20	Repair the supplemental restraint arming sensor jumper harness electrical connector C110. Has the connector been repaired?	--	Go to Step 27	--
21	Measure the resistance of circuit 1400 from the DERM electrical harness connector terminal A5 to the supplemental restraint arming sensor jumper harness electrical connector terminal A5 to the supplemental restraint arming sensor jumper harness electrical connector C110 terminal C. Is the resistance less than the value specified?	5 ohms	Go to Step 22	Go to Step 23
22	Repair the high resistance in circuit 1400 in the supplemental restraint arming sensor jumper harness. Has the high resistance been repaired?	--	Go to Step 27	--
23	Repair the high resistance in circuit 1400 in the SRS wiring harness. Has the high resistance been repaired?	--	Go to Step 27	--
24	Turn ON the ignition switch. Measure the voltage on the DERM electrical harness connector from terminal A5 to terminal A12 (ground). Is the voltage less than the value specified?	1 V	Go to Step 26	Go to Step 25
25	Turn off the ignition switch. Repair the short from circuit 1400 to B+. Has the short circuit been repaired?	--	Go to Step 27	--
26	Turn off the ignition switch. Replace the supplemental restraint arming sensor. Refer to Supl Rst Arming Sensor . Has the supplemental restraint arming sensor been replaced?	--	Go to Integrity Check	--
27	Reconnect all the SRS components. Ensure that the components are properly mounted. Have all the SRS components been reconnected and properly mounted?	--	Go to Step 28	--
28	Clear the SRS Diagnostic Trouble Codes. Have the SRS Diagnostic Trouble Codes been cleared?	--	Go to SRS Diagnostic System Check	--