Horns Inoperative (SIR)
Horns Inoperative (SIR)
Circuit/System Verification
Note: Refer to SIR Service Precautions (Technician Safety Information).
Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* Driver Steering Wheel Air bag
* Driver steering wheel air bag coil
* SDM
* Air bag wiring harness connector
* SDM wiring harness connector
Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.
1. Verify the scan tool Deployment Loop Resistance 1 and 2 parameters stay consistently between 2.1 and 4.0 ohm without any spikes or dropouts while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
• If there are spikes or dropouts
Replace the X85 driver steering wheel air bag coil.
• If less than 2.1 or greater than 4.0 ohm
Refer to Circuit/System Testing.
• If within 2.1 and 4.0 ohm without any spikes or dropouts
2. DTC B0012 or B0013 should only be set as a history DTC.
• If the DTC is set as current
Refer to Circuit/System Testing.
• If the DTC is set as history
3. Verify the scan tool Deployment Loop Resistance 1 and 2 parameters stay consistently between 2.1 and 4.0 ohm without any drop outs or spikes while moving the harness near each connector listed below.
* X85 Steering wheel air bag coil
* F107 Steering wheel air bag.
* Any harness inline
* K36 SDM
• If the reading is erratic while moving the harness, perform the following
* Inspect each connector terminal for damage or corrosion and repair as necessary.
* Apply Nyogel lubricant 760G to each connector terminal.
* Insure each connector and CPA is correctly seated.
• If within 2.1 and 4.0 ohm without any spikes or dropouts
4. All OK
Circuit/System Testing
1. Ignition OFF, disconnect the scan tool and disconnect the harness connector listed below at the F107 driver steering wheel air bag then wait for 120 seconds.
* DTC B0012 connector X1
* DTC B0013 connector X2
2. Test for greater than 25 ohm between the control circuit terminal 1 and the control circuit terminal 2.
• If 25 ohm or less
1. Disconnect the harness connector at the K36 SDM.
2. Test for infinite resistance between the two control circuits.
• If less than infinite resistance, repair the short between the two circuits.
• If infinite resistance, replace the K36 SDM.
• If greater than 25 ohm
3. Ignition ON.
4. Test for less than 11 V between the control circuit terminals listed below and ground:
* Control circuit terminal 1
* Control circuit terminal 2
• If 11 V or greater
1. Ignition OFF, disconnect the harness connector at the K36 SDM, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 SDM.
• If less than 11 V
5. Install a 3 A fused jumper wire between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
6. Verify the scan tool Deployment Loop Resistance parameter is consistently less than 2 ohm while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
• If the reading is erratic while turning the steering wheel
Replace the X85 driver steering wheel airbag coil.
• If 2 ohm or greater
1. Ignition OFF, disconnect the harness connector at the K36 SDM.
2. Test for less than 2 ohm in the driver steering wheel airbag coil and each control circuit end to end.
• If 2 ohm or greater, replace the coil or repair the open/high resistance in the circuit.
• If less than 2 ohm,ohm replace the K36 SDM.
• If less than 2 ohm
7. Replace the F107 driver steering wheel air bag.