DTC B1520 [BCM]

id0902f5834300

Description | Bonnet latch switch circuit malfunction
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Detection condition | • Open circuit in bonnet latch switch circuit with the bonnet closed (bonnet latch switch on).
Possible cause | • Bonnet latch switch connector or terminal malfunction • Open circuit in wiring harness between bonnet latch switch terminal B and body ground • Bonnet latch switch malfunction • BCM connector or terminal malfunction • Open circuit in wiring harness between bonnet latch switch terminal A and BCM terminal 1B • BCM malfunction

Diagnostic procedure

Step | Inspection | Action
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1 | INSPECT BONNET LATCH SWITCH CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the bonnet latch switch connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction? | Yes | Repair or replace the connector, then go to Step 7.
No | Go to the next step.
2 | VERIFY IF MALFUNCTION CAUSE IS BONNET LATCH SWITCH POWER SUPPLY CIRCUIT OR GROUND CIRCUIT • Verify that the bonnet latch switch connector is disconnected. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the bonnet latch switch terminal A (wiring harness-side). • Is the voltage 0 V? | Yes | A malfunction in power supply circuit can be considered. • Go to Step 5.
No | A malfunction in ground circuit can be considered. • Go to the next step.
3 | INSPECT FOR OPEN CIRCUIT IN BONNET LATCH SWITCH GROUND CIRCUIT • Verify that the bonnet latch switch connector is disconnected. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Inspect for continuity between bonnet latch switch terminal B (wiring harness-side) and body ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness which has an open circuit, then go to Step 7.
4 | INSPECT BONNET LATCH SWITCH • Inspect the bonnet latch switch. (See BONNET LATCH SWITCH INSPECTION.) • Is there any malfunction? | Yes | Replace the bonnet latch switch, then go to Step 7. (See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)
No | Go to Step 7.
5 | INSPECT BCM CONNECTOR • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction? | Yes | Repair or replace the connector, then go to Step 7.
No | Go to the next step.
6 | VERIFY IF MALFUNCTION CAUSE IS BCM OR BONNET LATCH SWITCH POWER SUPPLY CIRCUIT • Reconnect the BCM connector. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the BCM terminal 1B (wiring harness-side). • Is the voltage 0 V? | Yes | A malfunction in BCM can be considered. • Go to the next step.
No | A malfunction in power supply circuit can be considered. • Repair or replace the wiring harness which has an open circuit, then go to the next step.
7 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC displayed? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
No | Go to the next step.
8 | VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed? | Yes | Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [BCM].)
No | DTC troubleshooting completed.