DTC Troubleshooting: B1128
DTC B1128: Driver's door remote switch input circuit malfunction (Simultaneous input of lock and unlock signal)
DTC Description |
DTC |
B1128 Driver's door remote switch input circuit malfunction (Simultaneous input of lock and unlock signal) |
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1. |
Keyless/power door locks/security system check 1:
Keyless/power door locks/security system check 1
?1. |
Turn the vehicle to the ON mode. |
?2. |
With the driver's door lock switch in the neutral position, check the parameter(s) below with the HDS.
Signal |
Current conditions |
Values |
Unit |
Driver's Door Lock Switch(LOCK) |
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Driver's Door Lock Switch(UNLOCK) |
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Is either information indicator ON?
2. |
Keyless/power door locks/security system check 2:
Keyless/power door locks/security system check 2
?1. |
With the driver's door lock switch in the lock position, check the parameter(s) below with the HDS.
Signal |
Current conditions |
Values |
Unit |
Driver's Door Lock Switch(LOCK) |
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Driver's Door Lock Switch(UNLOCK) |
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Are both information indicators ON?
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Intermittent failure, the system is OK at this time.? |
3. |
Shorted wire check (REMOTE SW UNLOCK to REMOTE SW LOCK line):
Shorted wire check (REMOTE SW UNLOCK to REMOTE SW LOCK line)
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Disconnect the following connector.
Under-dash fuse/relay box connector D (24P) | |
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?3. |
Connect terminals A and B with a jumper wire.
Terminal A |
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Terminal B |
Body ground | |
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?4. |
Turn the vehicle to the ON mode. |
?5. |
Check the parameter(s) below with the HDS.
Signal |
Current conditions |
Values |
Unit |
Driver's Door Lock Switch(LOCK) |
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Driver's Door Lock Switch(UNLOCK) |
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Are both information indicators ON?
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Repair a short between the wires.? |
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4. |
Keyless/power door locks/security system check 3:
Keyless/power door locks/security system check 3
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Disconnect the following connector.
Power window master switch 24P connector | |
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?3. |
Turn the vehicle to the ON mode. |
?4. |
Check the parameter(s) below with the HDS.
Signal |
Current conditions |
Values |
Unit |
Driver's Door Lock Switch(LOCK) |
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Driver's Door Lock Switch(UNLOCK) |
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Is either information indicator ON?
5. |
Shorted wire check (REMOTE SW UNLOCK, REMOTE SW LOCK lines):
Shorted wire check (REMOTE SW UNLOCK, REMOTE SW LOCK lines)
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Disconnect the following connector.
Under-dash fuse/relay box connector D (24P) | |
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?3. |
Check for continuity between test points 1 and 2 individually.
Test condition |
Vehicle OFF (LOCK) mode Power window master switch 24P connector: disconnected Under-dash fuse/relay box connector D (24P): disconnected |
Test point 1 |
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Test point 2 |
Body ground | |
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Test point 1 |
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Test point 2 |
Body ground | |
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Are there continuity?
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Repair a short to ground in the wire(s).? |
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