Lexus IS250 IS220d GSE20 ALE20 - DOOR LOCK
INSPECT FRONT DOOR LOCK ASSEMBLY (DOOR KEY LOCK AND UNLOCK SWITCH)
CHECK WIRE HARNESS (FRONT DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH)
POWER DOOR LOCK CONTROL SYSTEM - Driver Side Door Key Lock and Unlock Switch Circuit
DESCRIPTION
The driver's door key lock and unlock switch is built into the driver's door lock assembly.
When the driver's door key cylinder is turned to lock all the doors by key, there is continuity between terminals L and E of the key lock and unlock switch. When the cylinder is turned to unlock the door(s), there is continuity between terminals UL and E.
Terminals KL and KUL of the multiplex network master switch assembly are connected to the door lock assembly, and door lock/unlock request signals (by key) are input to the multiplex network master switch assembly.
The multiplex network master switch assembly constantly applies voltage to terminal L of the driver's door lock assembly via terminal KL. When the driver's door key cylinder is turned to lock all the doors by key, current flows from terminal KL to terminal L. The multiplex network master switch assembly determines that this is door lock request signal input and sends a door lock signal to the main body ECU RH using multiplex communication.
The multiplex network master switch assembly also applies constant voltage to terminal UL of the door lock assembly via terminal KUL. When the door key cylinder is turned in the direction to unlock the door(s) by key, current flows from terminal KUL to terminal UL. The multiplex network master switch assembly determines that this is door unlock request signal input and sends a door unlock signal to the main body ECU RH using multiplex communication.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE OF DATA LIST |
Check the DATA LIST to ensure proper function of the door unlock detection switch.
| Item | Measurement Item / Display (Range) | Normal Condition | Diagnostic Note |
| Door Key Linked Lock SW | Driver door lock/unlock switch lock signal (key-linked lock switch) /ON or OFF | ON: Driver side door key cylinder is turned to LOCK OFF: Driver side door key cylinder is not turned to LOCK | - |
| Door Key Linked Unlock SW | Driver door lock/unlock switch unlock signal (key-linked unlock switch) /ON or OFF | ON: Driver side door key cylinder is turned to UNLOCK OFF: Driver side door key cylinder is not turned to UNLOCK | - |
- OK:
- The display is as specified in the normal condition column.
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| OK | ||
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| 2.INSPECT FRONT DOOR LOCK ASSEMBLY (DOOR KEY LOCK AND UNLOCK SWITCH) |
Remove the front door lock assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition 7 - 9 ON (Door lock set to LOCK) Below 1 Ω 7 - 9, 7 - 10 OFF (Free) 10 kΩ or higher 7 - 10 ON (Door lock set to UNLOCK) Below 1 Ω
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| OK | |
| 3.CHECK WIRE HARNESS (FRONT DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH) |
Disconnect the front door lock assembly connector.
Disconnect the multiplex network master switch assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
(Symbols)Condition Specified Condition M2-9 (L) - M7-4 (KL) (*1) Always Below 1 Ω M2-10 (UL) - M7-14 (KUL) (*1) Always Below 1 Ω M2-9 (L) - L17-4 (KL) (*2) Always Below 1 Ω M2-10 (UL) - L17-14 (KUL) (*2) Always Below 1 Ω M2-7 (E) - Body ground Always Below 1 Ω M2-9 (L) - Body ground Always 10 kΩ or higher M2-10 (UL) - Body ground Always 10 kΩ or higher
*1: LHD Models
*2: RHD Models
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| OK | ||
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