DTC C13A4: Open or Short Circuit in Release Switch Circuit; DTC C13AC: Release Switch Circuit Comparison [10/2020 - 10/2023]: Description
When the electric parking brake switch assembly is pulled to the release side, a release request signal is output to the parking brake ECU assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A4 | Open or Short Circuit in Release Switch Circuit |
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Yes | An electric parking brake system malfunction is displayed on the multi-information display. |
| C13AC | Release Switch Circuit Comparison |
|
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Yes | An electric parking brake system malfunction is displayed on the multi-information display. |
| Vehicle Condition | |||||
| Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | ||
| Diagnosis Condition | Electric parking brake switch assembly is operated to lock side with power switch off | ◦ | ◦ | - | - |
| Power switch on (IG) | - | - | ◦ | ◦ | |
| Malfunction Status | REL1 terminal voltage is below 1.4 V (*) | ◦ | - | ◦ | - |
| REL1 terminal voltage is above 9 V (*) | - | ◦ | - | ◦ | |
| Detection Time | Approximately 1 second | Approximately 1 second | Approximately 1 second | Approximately 1 second | |
| Trip Count | 1 trip | 1 trip | 1 trip | 1 trip | |
| Vehicle Condition | |||||
| Pattern 5 | Pattern 6 | Pattern 7 | Pattern 8 | ||
| Diagnosis Condition | Electric parking brake switch assembly is operated to lock side with power switch off | ◦ | ◦ | - | - |
| Power switch on (IG) | - | - | ◦ | ◦ | |
| Malfunction Status | REL2 terminal voltage is below 1.4 V (*) | ◦ | - | ◦ | - |
| REL2 terminal voltage is above 9 V (*) | - | ◦ | - | ◦ | |
| Detection Time | Approximately 1 second | Approximately 1 second | Approximately 1 second | Approximately 1 second | |
| Trip Count | 1 trip | 1 trip | 1 trip | 1 trip | |
HINT:
- If the conditions match either of these patterns, a DTC will be output.
- *: This value is based on the assumption that the BECU terminal voltage is 11 V.
The threshold changes according to the BECU terminal voltage.
For details, refer to "Threshold Changes According to BECU Terminal Voltage".
Threshold Changes According to BECU Terminal Voltage
| *a | BECU Terminal Voltage (V) |
| *b | REL1 or REL2 Terminal Voltage (V) |
| *c | Normal Range |
| *d | DTC Detection Range |
| Vehicle Condition | |||
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | Electric parking brake switch assembly is operated to lock side with power switch off | ◦ | - |
| Power switch on (IG) | - | ◦ | |
| Malfunction Status | Release 1 switch and release 2 switch ON/OFF evaluations do not match | ◦ | ◦ |
| Detection Time | Repeats 5 times | Repeats 5 times | |
| Trip Count | 1 trip | 1 trip | |
HINT:
If the conditions match either of these patterns, a DTC will be output.