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Optima/Magentis(MG) > 2010 > D 2.0 TCI-D > BCM > Power Distribution
Module > B1991 Immobilizer TX Short Circuit To Ground
B1991 Immobilizer TX Short Circuit To Ground > General Information
Component Location
General Description
The body electrical system is comprised of four ECU applied CAN*¹ communication nodes.
※ Control Units : BCM (Body Control Module), PDM(Power Distribution Module), CLU (Cluster) , SMK(Smart
Key) ECU.
After insert the fob into the fob holder, press SSB button. Then, the communication state between the fob and the
immobilizer is inputted to PDM.
*¹ CAN (Controller Area Network) : CAN is serial bus communication type which links not only communication
system but also control units each other.
*² LIN (Local Interconnect Network) : LIN is serial communication type which is used in electrical control system.
(This is less expensive.)
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DTC Description
This code is outputted when the immobilizer data circuit is shorted to ground.
(In this case, it is not possible to get authorization although the fob is in the holder.)
DTC Detecting Condition
Item Detecting Condition Possible Cause
• Immobilizer data line check
DTC Strategy
(by voltage monitoring)
• The communication state between the fob and the
Enable Conditions fob holder when SSB button is pushed. (The fob is
in the holder.)
• Short to ground in
• Short to ground in immobilizer data circuit (2V and immobilizer data circuit
Threshold Value
below)
Diagnostic Time • Immediately
• DTC is erased immediately after trouble fixed.
DTC Erasing Time
(After communication recovery)
Diagnostic Circuit Diagram
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Signal Waveform & Data
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Fig 1) IMMO_CLOCK & IMMO_DATA signal waveform
B1991 Immobilizer TX Short Circuit To Ground > Scantool Diagnostics
Scantool Data Analysis
1. Connect GDS.
2. IG "ON" and engine "OFF".
3. Select "DTC Analysis" mode.
4. After erase DTC, keep the vehicle condition within "the enable conditions" (Refer to "DTC Detecting Condition"
5. Is the same DTC occurred again?
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▶ Go to next procedure.
▶ Fault is intermittent caused by poor contact in PDM's connector or was repaired and
PDM memory was not cleared. Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace
as necessary and then go to "Verification of Vehicle Repair" procedure.
Service Data Analysis
1. IG "OFF" and connect GDS.
2. IG "ON" and select "Current Data" menu.
3. Check the service data of SMART KEY HOLDER INSERT SIGNAL.
Specification : INSERT (When the fob is inserted in the holder.)
4. Is the service data within specifications?
▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion,
contamination, deterioration, or damage. Repair or replace as necessary and then go to
"Verification of Vehicle Repair" procedure.
▶ Go to next procedure.
B1991 Immobilizer TX Short Circuit To Ground > Inspection/Repair > W/Harness
Inspection
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Terminal & Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be
caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,
deterioration, or damage.
3. Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to next procedure.
Immobilizer TX Terminal Inspection
■ Check short to ground on IMMO TX terminal
1. IG "ON" & ENG "OFF".
2. Disconnect the connectors of IPM,PDM,ESCL.
3. Measure resistance between IMMO TX terminal and chassis ground.
Specification : ∞ Ω
4.
5. Is the measured resistance within specifications?
▶ Substitute with a known - good PDM and check for proper operation.
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If the problem is corrected, replace the unit and go to "Verification of Vehicle Repair"
procedure.
▶ Substitute with a known - good fob holder and check for proper operation.
If the problem is corrected, replace the unit and go to "Verification of Vehicle Repair"
procedure.
▶ Repair as necessary and go to "Verification of Vehicle Repair".
B1991 Immobilizer TX Short Circuit To Ground > Verification of Vehicle Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "DTC Analysis" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Is any DTC outputted again?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
B1991 Immobilizer TX Short Circuit To Ground > Circuit diagram
Schematic Circuit Diagram
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