Lexus NX: Fail-safe Chart
FAIL-SAFE CHART
FAIL-SAFE FUNCTION OF CONTROL SYSTEM
(a) When a malfunction is detected in the brake control system, the skid control ECU (brake booster with master cylinder assembly) turns the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights on, flashes the brake hold operated indicator light*, as well as prohibits ABS, BA, TRAC, VSC and brake hold operation.
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*: The brake hold switch (integration control and panel assembly) is turned on under the following vehicle conditions.
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Vehicle Conditions:
- The driver's door is closed.
- Driver's seat belt is fastened.
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Vehicle Conditions:
(b) If the skid control ECU (brake booster with master cylinder assembly) detects that a system related to the hybrid control system is malfunctioning, it will prohibit operations of the TRAC and VSC systems in order to prevent further malfunctions and to protect the systems.
(c) Brake hold control prohibits brake hold operation in order to protect the system and prevent improper operation when the electronically controlled brake system, electric parking brake system or hybrid control system is malfunctioning.
| Item | Operation |
|---|---|
| Malfunction in the ABS. | ABS, BA, TRAC and VSC control prohibited. Brake hold control prohibited* |
| Malfunction in the BA system. | ABS, BA, TRAC and VSC control prohibited. Brake hold control prohibited* |
| Malfunction in the EBD system. | ABS, EBD, BA, TRAC and VSC control prohibited. Brake hold control prohibited* |
| Malfunction in the TRAC system. | ABS, BA, TRAC and VSC control prohibited. Brake hold control prohibited* |
| Malfunction in the VSC system. | ABS, BA, TRAC and VSC control prohibited. Brake hold control prohibited* |
- *: Only during brake hold control
FAIL-SAFE FUNCTION OF HYDRAULIC SYSTEM
(a) If a malfunction is detected in the skid control ECU (brake booster with master cylinder assembly), brake actuator (brake booster with master cylinder assembly) or an individual sensor, control will be stopped and brake effort will be generated by the hydraulic brake booster (brake booster with master cylinder assembly).
(b) If brake control is stopped due to a malfunction in the hydraulic pressure source, the pressure generated in the master cylinder by the driver is applied to the wheel cylinders to ensure braking force.
| Item | Operation |
|---|---|
| Skid control ECU (Brake booster with master cylinder assembly) malfunction. | Hydraulic brake booster (brake booster with master cylinder assembly) generates braking force. |
| Hydraulic pressure controlling components malfunction. | Hydraulic brake booster (brake booster with master cylinder assembly) generates braking force. |
| Power supply components (Hydraulic pressure source) malfunction. | Braking force solely generated by the driver. |
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Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Th
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Electronically Controlled Brake System DTC No. Detection Item INF Code Note Link C1202 Master Reservoir Level Malfunction 371 - - C1203 EC
Master Reservoir Level Malfunction (C1202)
DESCRIPTION When a fluid level drop in the brake master cylinder reservoir assembly is detected, a signal is sent to the skid control ECU (brake booster with master cylinder assembly). If a DTC for th
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Removal
REMOVAL PROCEDURE 1. PRECAUTION NOTICE: After turning the power switch off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal. Click here 2. REMOVE NO. 3 DECK BOARD SUB-ASSEMBLY Click here 3. REMOVE REAR DECK FLOOR BOX Click here 4. REMOVE DECK FLOOR
Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE:
When replacing with a new inverter with converter assembly, securely lock the retainer of the inverter cooling hose since it is not locked.
Before replacing the wire harness boot, check if any DTCs are output.
HINT: Remove the tape that was attach
