Circuit Description
DTC C1295 identifies open brake switch circuitry that prevents the brake switch input to the EBCM from changing states while applying the brake. DTC C1295 is used in conjunction with DTC C1291 and DTC C1292 to determine the cause of an open brake switch malfunction.
Conditions for Setting the DTC
DTC C1295 can set after initialization is complete.
A malfunction exists if the brake switch input voltage is out of specification for one second. An open circuit exists when the brake switch input voltage is out of specification.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | ABS disables. |
| • | The amber ABS warning indicator turns on. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | 100 drive cycles pass with no DTC(s) detected. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | A poor connection |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual for the procedure.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physical damage to the wiring harness |
Important: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |||||||
2 |
Do not start the engine. Does the Scan Tool indicate that the brake switch circuit is open? | -- | ||||||||
3 | Apply light pressure to the brake pedal while monitoring the Brake Switch Position on the Scan Tool . Does the Scan Tool indicate that the brake switch is on within 25 mm (1.0 in) of the brake pedal travel? | -- | ||||||||
4 |
Are the rear brake lamps on? | -- | ||||||||
5 |
Do not start the engine. Is the voltage equal to or greater than the specified voltage? | 10.0 V | ||||||||
6 | Inspect the 24-way EBCM connector C1 and the 24-way EBCM harness connector C1 for the following conditions:
Are poor terminal contact, terminal corrosion or damaged terminals evident? | -- | ||||||||
7 | Repair the open in CKT 17. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||
8 | Replace all the terminals or the connectors that exhibit the following conditions:
Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||
9 | Repair the open brake lamp circuit wiring. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||
10 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||
11 | The malfunction is intermittent or is not present at this time. Is the action complete? | -- | Go to Diagnostic Aids | -- |
